Kwik-Way Info Sheets

Valve Grinder Chuck Inspection

Chuck accuracy is critical to producing a quality valve job. Most O.E.M.'s require a valve face run-out to be below .0015. To accomplish this, the chuck in a valve grinder must not only run-out below .0015, but must repeat this every time. High performance engines require even greater accuracy. In some cases run-out must be below .0005. How do you determine the accuracy of the chuck in your machine? There is basically one easy method that can be used which provides an accurate evaluation.

Start by finding a known round and straight part. A valve seat pilot, carbide if you have one will work very well. If you do not have one, use a section of drill rod that is straight and round. This will be your test piece.

1. Insert the test piece into the chuck so that it is gripped correctly and has at least two inches of protrusion past the face of the chuck.
2. Install a dial indicator (.0000 reading if possible) so as to have the plunger contact the test piece one inch from the face of the chuck.
3. Turn the machine on and observe the indicator as the chuck is rotating. The reading at this point should not exceed .0015.

If the reading is inexcess of the .0015, you can first disassemble the chuck and clean it thoroughly. (Follow directions given in the machine manual). Examine the ramps on which the ball bearings ride, if wear is evident (grooves), the chuck will require placement. Kwik-Way provides new chucks that have less than .0005 run out and for the standard SVSIID and a Hi-Performance version with less than .0002 run out.

If you have any quesitons in regards to chuck performance, or if you need a replacement chuck, contact;

Kwik-Way Tech Services at 800-553-5953.

Our Van Norman Flywheel Grinders are one of the most profitable machines you could own.  They are not difficult to operate or maintain and tend to last a long time without the need for service if you do the few things that need to be done to maintain them. With a little instruction just about anyone in your shop can grind a flywheel successfully. The setup is easy and the job itself goes very fast. Typically, you should be able to get about $100 per hour if you have steady work for your machine.   Even if you don't have enough in-house work for it, you can likely get some outside jobs from other shops who don't have a flywheel grinder. There are also optional accessories available that allow you to do more than just grind flywheels.  It's becoming more common for Heavy Duty Trucks to have disc brakes with rotors that can be ground on our Van Norman Flywheel grinders with our Optional HD Truck Rotor Kit.

Here’s a quick overview of how to set up and use your flywheel grinder.

Select the proper stone

Not all stones are created equal. Make sure you’re using the correct stone for the material you are grinding – cast steel, billet steel or cast iron. If you aren't sure, you can ask your Irontite Sales Associate to help you determine the best stone for the type of material you will be grinding. There are also CBN wheels that you can use. These are much more expensive, but they also last about 10 times longer and some technicians feel they provide a better cut. CBN wheels are not dressed by removing material like traditional grinding stones. Instead, there is a cleaning stick that is used to remove any stuck-on material from the cutting surface of the CBN Wheel.

    

           
General Purpose Stone                                CBN Wheel

Mount and Dress the Stone

Follow our guidelines found in this section of the website for the correct dressing technique. The article was originally written for valve seat grinding stones, but the dressing principles apply to any grinding stone. You can view this Article here. The Van Norman Flywheel Grinders typically come with a Star Wheel dresser, but there is also a Diamond Dresser available. And, of course, if you are using a CBN wheel, then you do NOT want to use either of these dressing methods. Your dressing technique will influence how the stone reacts against the flywheel material. Basically, a quick pass dress will open the pores of the stone and deliver a rougher finish but cut more aggressively, and a more slow pass will close up the pores delivering a finer finish. You should vary your technique to determine which method is best suited for the flywheel you are grinding.

Coolant, coolant, coolant

Be sure to check your coolant reservoir and skim the tramp oils on a regular basis, especially during the heat of summer. Your coolant will experience some evaporation.  A good way to combat loss of coolant is to mix the coolant in a separate 5-gallon container with a lid so that as you need additional coolant it will already be mixed and ready to pour in.  This will also prevent altering the coolant mix ratio that can happen when you add a little more water here and there and then maybe a splash of concentrate and before you know it your coolant is too watery and things rust or it's too concentrated and your grinder isn't cutting like it should. 

The coolant you use and how it's mixed can greatly affect the effectiveness of your grinder.  Irontite has spent considerable time researching and experimenting with all different kinds of grinding coolant concentrates at differing mix ratios to come up with our recommended coolant concentrate product and the best mix ratio for most operations.  As always, if you have questions, your Irontite Sales Associates are knowledgable about our products and can help you make an informed choice.  They are at 800-553-5953 during regular business hours.

Ideally, you would just have a schedule for changing your coolant, but every shop is different and some weeks the grinder is busy while others it's not, so here are 3 ways you can tell if your coolant needs to be changed:

1. The coolant is so dirty you can't see through it
2. You find yourself dressing the stone more often than normal
3. You can feel more than one inch of sludge in the reservoir

A great tip/trick is to get a powerful magnet (they have gotten inexpensive in recent years if you shop for one), something about the size of a drink coaster or a little smaller and place it in your coolant reservoir on the bottom as far away from the pump as you can.  This will attract the metal shavings and prevent them from flowing back up to the work site.   Another idea is to create your own larger reservoir with a sludge trap of some kind to continuously filter the coolant.

Be sure to inform everyone who uses the machine to never use any other chemicals on parts that are on or over the machining surface.  Using something like rust preventitive on a part still attached to the grinding table can contaminate the coolant in short order.   So it's best to just have a rule that you always remove any items from the machine and never use anything other than coolant while at the grinder.

Mounting

Remove any dowel pins prior to mounting the work piece using a dowel pin puller. Be sure to keep track of the dowel pins and return them to your customer. When mounting, use the crankshaft-mounting flange as your reference. It's important to clean and deburr the flange and table surface before mounting. Select the appropriate flange adaptor and a centering cone. Tighten the centering cone bolt to secure the assembly to the table. Insure there is no movement and rotate the table to be sure the grinding wheel is not going to contact anything that it should not.  When doing a stepped flywheel, keep in mind that the torque of the grinding motor can make the stone move slightly and you want to insure that the stone will not bump up against the wall of a step.  This could cause internal cracking in a stone that will lead to the stone breaking aggressively.

There are also many optional mounting kits to help you mount all different kinds of flywheels and other types of materal.   Here are several to choose from. 

Grind Away

Hand feed the grinding wheel so that it almost touches the work piece. Put on your safety face shield and position the machine’s grinding wheel safety shield and the coolant shroud protective shield. Turn on the coolant, then the table, then the grinding motor. Manually feed the stone into contact with the work piece. You will know the stone is about to touch when the coolant on the back side of the stone begins to foam slightly.  Now feed approximately .001 per revolution of the work piece. A constant spark pattern is necessary for efficient grinding. This will also cause the stone to break down and keep cutting more freely as well as keeping the stone from loading up. There will be times that you will need to stop grinding and redress the stone.  If you are using a CBN wheel and it's making a lot of noise (singing) this is typically a lack of necessary downward pressure. CBN wheels require fairly aggressive cutting pressure.  Or it could be dirty coolant or the CBN wheel needing to be cleaned with a CBN Dressing Stick.  Continue grinding until you obtain both the finish and specification required for the flywheel.

If you have the auto-feed option on your grinding machine, you can set the depth of cut you want and use the auto feed rate knob to adjust how aggressive the cut will be.

Most manual machines will grind the average flywheel in about 10 to 15 minutes. Larger diesel type flywheels will take longer but you can charge more for those. The average labor charge for a flat flywheel is about $35 to $45. The labor charge for larger diesel flywheels averages $65 to $125

Maintenance … is key

It's critical the flywheel grinder is level for proper operation.  This is because the table actually floats on a bath of special lubricant called Table Lube.  If the table is not level, then it can leak table lube and/or set up an unwanted wear pattern on the under side of the table.  Eventually this can cause serious problems with the machine's operation and obtaining good flat grinds. Always keep the site jar located in the back right corner of the machine filled with table lube.  This keeps the level under the table up and also feeds the lubricating wick in the neck of the grinder column.  There is also a dip stick for checking your table lube, but, in most cases, if you keep your site glass jar filled you won't need to use the dip stick.

Cleaniness is....

Grinding is a dirty business.  It makes your grinder dirty.  However, you can extend the grinder’s life and profitability by wiping down the inside and outside after every job. A coat of wax for any painted metal surface will go that extra mile. The wax will make the wipe down go much easier too. The inside of the coolant shroud also needs to be cleaned and waxed to prevent crud build up. If you don't wipe after every job, the build up of all the stuff splashing around will attach and harden making it extremely difficult to ever get off and will also hinder a wipe-down by catching your cloth.

Use a deburring stone to knock down any dings or dents that occur on the grinding table when mounting flywheels. This little procedure will increase the accuracy of your flywheel set-up. Inspect all your tooling and adapter rings before using.  You are cleaning them anyway, why not pay attention to them and see if you have any marks that could introduce problems.  If so, get them replaced right away.

Use a wire brush on the threads of your hold-down bolts so they don’t carry debris into the threads of your center-mounting hole. It’s also a good idea to periodically replace the center bolt hole thread. Our EZ-Lok replacements make it quick and easy to keep your mounting threads like new.  These come with locktite red on them so you may need to use a little heat to get them free from the table.  But changing them on a regular basis will keep your table and its spindle in good shape for many, many years. Organize your tool board so you can quickly find the necessary tooling for mounting the next flywheel.

Check all Lubrication

Always double check your instruction and parts manual to be sure you use the recommended lubricants for your machine. 

Open the back of your machine and find the leadscrew. The leadscrew needs to be clean and well lubricated. It’s always best to use the leadscrew Lube specified in the owners manual. There should be a leadscrew nut that the leadscrew goes through. This nut also needs to be lubricated and has an adjustment procedure to keep your machine from having "head drop". The owners manual gives you step-by-step instructions for this.  It's a good practice to run your grinder column all the way to the top and all the way down at least once a week.  This is to help keep the leadscrew lube distributed over the entire leadscrew.  Over time, most operation takes place in the same small area of the leadscrew forcing the lube away.  Running the head up and down redistributes the lube.

The grinding head locking system only needs to be adjusted if after locking you can move the head.  Over time, the head may become difficult to move from side to side.  After you insure that this problem is not because the lock is engaged, there are 2 grease zerks on the opposite side of the column where you can apply regular automotive grease to lube the column top. 

Also, check to make sure the grinding head tilt is what the manufacturer designates and adjust accordingly. Inspect your dresser. Some machines have a star dresser and others have a diamond. Make sure the star is rotating and spins freely. If it doesn’t, it’s time to replace it. For machines that have a diamond, make sure it’s sharp and periodically rotated to insure even wear. Always replace if in doubt.

Always measure - never guess!

It’s a good idea to use a dial indicator when determining how much material is being removed. The leadscrews are very accurate, however, they are no replacement for actual measurement of how much of the stone wore away during the grinding process.  This is even more critical when you are working on a stepped type flywheel. You must insure you remove the exact amount of material from the pressure plate surface as you do for the clutch disc surface to insure the original geometry stays intact.

Taking care of your flywheel grinder will allow it to make money for you for many years. And if and when you do decide to upgrade or replace it for a new machine, it will have a higher resale value.

Remember, if you have more questions, contact  Irontite Products Inc at 800-553-5953

By far, the best way to determine which model of Valve Refacer you have is to give your serial number to the Kwik-Way Representative when you call in. The Serial number is located above the 15 degree mark on the angle gauge of all but the very oldest valve refacers. For most of them there will be a letter D or S after the first letters of SVS, but some of the really old units might have a number like "KK 234". Regardless, if you give the entire set of letters and numbers to a Kwik-Way Representative, they will be able to insure that you are getting the correct parts or consumables for your particular model of Valve Refacer.

Here is a photo of a 2009 production serial number.

Here are some other things that will help you identify your SVS valve refacer.

Early SVS	SVSII D (Deluxe)	SVSII S (Standard)
Serial Numbers:202-2681	SNs: 3,003-5173; 10,000(KWP) and up.	SNs: 10,003-10,166
Air Operated Chuck	Air Operated Chuck	Lever Operated Chuck
Variable Speed Chuck	Variable Speed Chuck	One Speed Chuck
Aluminum Chuck Cover	Plastic Chuck Cover	Plastic Chuck Cover
Rubber Mat on Chuck Cover	No Rubber Mat on Chuck Cover	No Rubber Mat on Chuck Cover
Does not have a valve counter	Valve counter present	Does not have a valve counter.

A very common concern with any boring bar is that the bar sometimes will not repeat on bored size. This can be caused by one a few different things, or a combination of more than one.

You set your mike and bore a hole and find the hole is oversized, you reset the mike and the next hole is then undersized, obviously there is something that is not right.

First thing we would look for are scores or scratches in the micometer face. If the mike is damaged, the bar will not repeat.The mike should be returned to KW and the face reground and repaired.

Micrometer stem bend, will cause the same problems depending on the amount of bend and the amount of stock to be removed. A quick way to determine if the stem is bent is to insert a feeler gauge (.002) between the face of the mike and the tool bit, then tighten the bit. The feeler gauge should stay in place, and if you slowy rotate the mike in the boring head, the tension in the feeler gauge should not increse or decrease. If it does, the stem is bent and requires replacement.

Another thing to check is if the micrometer not locating into the boring head correctly. The stem of the mike has a V-groove in it which works with a spring loaded ball bearing to insure correct position of the mike into the head every time. If the groove is worn or the ball is out of adjustment, the bar will not repeat on size. The micrometer should "snap" into the head and when slight rearward pressure is applied, the mike should snap back into the boring head. If it does not the ball positon will need to be adjusted. Contact Tech Services for assistance in this case.

If you tighten the tool bit and the tool bit moves away from the feeler gauge, and the feeler becomes loose, there is a different problem. Either the tool gib, tool holder or boring head is worn. You can examine the tool holder quite easily by simply checking the angle where the gib plate contacts the tool holder for visable wear and also feel it for any step. If worn, it will require replacement. You will need to remove the gib from the boring head to examine it for wear also, if the tool holder is worn, it is likely the gib will be worn also.

The boring head can also be worn, and cause the same problem as the tool gib or holder. If the boring head is worn, then the head will need to be replaced. Rebuilding a boring head is only something that the factory can do, and all heads may not be repairable. A combination of two or more of these concerns may be found on the same machine. These findings are normally on very old or high service units.

These are but a few possible causes for potential boring errors in bore size.

As always please contact KW Tech services for further help if required.

4mm Valve Chuck Disassembly / Assembly Tool

PN: 012-1054-60

[This tool is required to perform the following operations]

Disassembly Instructions

STEP 1: Remove the chuck cover from the Chuck Bearing Assembly, being careful not to pull any wires from the cover.. Rotate the Chuck so that the Grind Mark on the front collar and the Yellow Mark on the Spring are Vertical as show in the photo below.

STEP 2: Remove the (3) three 8 x 32 x 5/16 slot head screws from the Chuck End Cap (Black) shown below.

STEP 3: Use the Disassembly Tool (picture at the top of this document) which is standard equipment with your machine, put the 8 x 32 screws (3) into the chuck shaft in a 1/4 of an inch. Put the 1/4 x 20 Hex Head Bolt finger tight against the End Plate.

STEP 4: Remove the Chuck Yoke.

STEP 5: Loosen the 1/4 x 20 Hex head bolt counter clockwise. As you release the 1/4 x 20 bolt, the spring pressure should begin to release.. NOTE: You may need to soak the chuck in Automatic Transmission Fluid to remove grit and make the collars slide easier.

STEP 6: Remove the Chuck Disassembly Tool.

STEP 7: Begin to remove the outer collar from the chuck shaft. Next, remove the Loading Cup with the Four (4) springs. The large spring and inner collar will be removed along with the Thrust Step Washer. As you take the Inner collar off the steel chuck balls(9/16) may fall out of the chuck shaft.

STEP 8: Remove the Chuck Handwheel and belt from the chuck shaft. Remove the chuck from the chuck bearing assembly. Clean all parts with a parts cleaning solvent.

Assembly Instructions

STEP 9: (1) Put the shaft back in the chuck bearing slide, use transmission fluid only and coat the chuck shaft. Make sure the keys are vertical.

(2) Put the thrust washer, spring, and (3) three rear balls back on the chuck shaft, making sure that the Yellow mark is lined up with the Keys. hold on to the bottom balls so they don't fall out of the shaft.

(3) Slide on the Inner collar, so all three rear balls are inside of the collar.

(4) Put the front set of balls in the shaft. Install the loading cup with four(4) springs facing out.

(5) Install the outer collar, making sure the grind mark is lined up with the keyways.

(6) Reinstall the Disassembly tool. Put the three screws (8 x 32) in one quarter (1/4) of an inch. Begin to tighten the 1/4 x 20 bolt, making sure that the collars are still lined up with the keys. Run 1/4 x 20 bolt in until it is tight.

(7) Reinstall the Chuck Yoke.

(8) Remove the Disassembly Tool and reinstall the chuck End Cap with the three 8 x 32 screws.

(9) Reinstall the chuck Handwheel and Belt, making sure the chuck and chuck handwheel are snug to the chuck bearing slide.

(10) Reinstall the chuck cover. Make sure there are no wires touching the chuck.