Thread: Grinding Wheel Runout

Stu and Pete,

Norton refer to them as blotters and the one on my cup wheel is slightly larger than the nut. It has been glued on crookedly. The spindle nose is 3/4". I started scribbling a drawing of a sleeve at lunchtime. The length of the unthreaded portion of the spindle is the problem.

BT

Hi All,

I've seen them referred to as packing washers, but paper washers or elastic packing would be just as good.

Regards
Ray

Bob,
how much were the Norton 150x13 wheels? Just curious. The same size white oxide wheels from Abrasiflex were about $12 in 46 and 80 grit.

Blotters was the word I was thinking of.
It looked like the nut wasn't fully supported by blotter. Another perfectly good theory down the drain. lol
Stuart

Originally Posted by jack620

Bob,
how much were the Norton 150x13 wheels? Just curious. The same size white oxide wheels from Abrasiflex were about $12 in 46 and 80 grit.

Hello Jack,

A touch more at $14.50. I'm picking them up on Friday.

Bob.

Pretty reasonable price for Norton I reckon. Good luck with them Bob.

I picked up the wheels this morning. There is 40 thou axial runout on one wheel and about 20 on the other. Radial runout is about 8 thou on both. Norton offered solid spacers along with the equivalent of the gumby ones provided by Abrasiflex. I opted for the solid version. I mentioned Pete's idea of epoxying an aluminium spacer in place to the bloke at the fastener company where I purchased the wheels. He started squirming, reckoned Norton wouldn't warranty the wheels. I'm sure if a wheel let go while in use, they'd say the user must have stuffed something up. Neatly printed on the blotter in tiny lettering is made in prc. I bought a length of aluminium bar from Bohler anyway.

The other thing that I did was to call into Statewide Bearings to find out about the availability of standard flat belts. I had been discussing the twin vee belt setup with Steve D at Hercus and he suggested doing away with that setup and using a flat belt as per the later Hercus No.1 T and C grinder given that I needed to make a new motor pulley. Being lazy, it seemed like the easiest solution. It would have meant making a new spindle pulley as well but without the fiddly vees.

I walked out of Statewide with a taper lock bush and taper fit pulley for a total of 15 dollars . I've forgotten about the flat belt.

Wheel guards are next.

BT

Originally Posted by Anorak Bob

I picked up the wheels this morning. There is 40 thou axial runout on one wheel and about 20 on the other. Radial runout is about 8 thou on both. Norton offered solid spacers along with the equivalent of the gumby ones provided by Abrasiflex. I opted for the solid version. I mentioned Pete's idea of epoxying an aluminium spacer in place to the bloke at the fastener company where I purchased the wheels. He started squirming, reckoned Norton wouldn't warranty the wheels. I'm sure if a wheel let go while in use, they'd say the user must have stuffed something up.

My suggestion was certainly unconventional Bob, and I'm not surprised the bloke got a bit squirmy. By the same token I can't see any reason that putting any type if metal as a spacer should cause any undue stress. If you didn't need a spacer the wheel would be mounted directly on a metal arbour or spindle.

I don't think the slight "wobble" would cause any great grief. I notice some of my wheels do that but you're not grinding on that face. It possibly leads to vibration however.

Pete

Originally Posted by Anorak Bob

I picked up the wheels this morning. There is 40 thou axial runout on one wheel and about 20 on the other.
BT

Hi BT,

I guess 40 thou run-out is better than 1mm

Regards
Ray

Originally Posted by Pete F

By the same token I can't see any reason that putting any type if metal as a spacer should cause any undue stress. If you didn't need a spacer the wheel would be mounted directly on a metal arbour or spindle.
Pete

Pete,

I remember years ago getting new grinding wheels which had a fixed-in-place lead bush, so metal bushes were apparently acceptable. These were easy to drill oversize for larger shafts.

Frank.

I believe the reason they dont want a solid bush that it tight on the spindle and tight in the wheel is that the sides of the wheel may not be perfectly square to the bore of the wheel. If the spacer is is tight it will try and hold the wheel and an angle, the flanges will try and "bend it square".

Stuart

Originally Posted by Stustoys

I believe the reason they dont want a solid bush that it tight on the spindle and tight in the wheel is that the sides of the wheel may not be perfectly square to the bore of the wheel. If the spacer is is tight it will try and hold the wheel and an angle, the flanges will try and "bend it square".

Stuart

Isn't that one of the reasons blotters are used? They are slightly compliant to "give" a little and prevent excess pressure at specific points on the wheel.

Pete

I was looking through some old Hercus literature yesterday and found that the original wheels specified for the grinder had 3/4" bores. That would have meant a metal to abrasive fit unless the bore was lead bushed as per Frank's post. I will make an aluminium spacer and see how it goes. The Dumore wheels I have are not bushed.

I can see how a machine would be subject to wear and tear from grit as a result of wheel dressing ( and grinding ). The stuff goes everywhere even with the nozzle of the ShopVac in close proximity to the diamond. How do you deal with the grit Pete?

Bob.

Originally Posted by Anorak Bob

How do you deal with the grit Pete?

The same shop vac nozzle technique accompanied with much cussing. Despite using many different languages none seemed to help so I now resign myself to the fact that grit really does just go everywhere

I will eventually make up a good permanent vac arrangement for that, and to be honest combined with the little "scoop" that sits on the end of the table it isn't too bad, and most of the grit falls within a close distance of the machine. It seems to bounce off any hard surface and very much elude capture however! I also orientated the machine so it's not pointing at anything important (mine goes off towards my bench grinders). I don't have it in the same room as my lathe or mill.

Pete