WAG response would be that you need a new part or you'd need to fit slightly
oversize pins in the existing disk, although the hardness of the disk may
have been compromised by the heat soak, and could be annealed now.

Not knowing what the metal alloy(s) are, you should probably get a new
replacement part from the machine maker.

Another possibility is that the pins may have been shrunk-fit into the
disk.. which has little meaning now that the holes are oversize.

Some plastics are abrasive, and HSS pins may exhibit considerable wear if
used to grind some plastics.. also, plastic may be more likely to stick to
HSS.
Carbide pins would likely be brittle (depending upon how far they protrude
from the disk) but more durable/less wear, and less likely to have the
plastic stick to them.

When you say "mils" while talking about dimensions of parts, it's unclear
what sizes you're trying to describe.

Mils are common to film thicknesses.. heavy duty trash bags are 3 mils, or
coatings thicknesses/paint coatings etc.

Mils isn't a shortened term meant to represent mm or millimeters (like
tranny for transmission or the other s/he kind).
Whereas a tranny fitting would generally be referred to as an adapter (or
possibly a dressmaker term).

Millimeters are millimeters or MM/mm, so 118mm is about 1-3/4".

Mils are thousandths-of-an-inch, but 0.118" isn't expressed as 118 mils..
and 0.118" would be smaller than 1/8" in diameter.
Maybe you're referring to the diameter of the pins, but it's not really
clear.. 3mm is 0.1181").

Finally, if you expect to have frequent questions or comments regarding
metalworking, home shop practices or similar topics (all welcome here in the
RCM usenet newsgroup), get a news reader program, or use your email program
with a news subscription or news feed service, instead of posting thru the
"diybanter" or other online/web reader.

--
WB
..........


"asd108b" wrote in message
...

I have a metal disk with pins in it (~118mils diameter) that is part of
a grinder machine. I believe the disk and pins are both hardened steel
since it is used for grinding plastic flakes into powder but I have no
idea what kind. I heated the disk to ~1100F for ~2hrs to burn off some
resin that got stuck to it that I was grinding. After heating the plate
all the pins are all loose. I did not realize that the pins were press
fitted into the disk.

My question is, can I reverse the process by reheating. Should I heat
the metal plate without the pins in it. Will quenching the plate cause
the holes to shrink further ? Any thoughts or ideas would be greatly
appreciated

Thanks

Andy




--
asd108b