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Why do indexable insert tool holders have a shim, what is it made of, etc?
I will post an even dumber question as soon as I think of one.
The carbide seat used under a lay down type of threading insert on a lathe is actually tapered. The taper is different according to the diameter of the part you are threading.
Rabtrfld and Bob,
The number one reason for a Shim in the pocket of a lay down thread bar is to control the Helix of the thread. The other reasons listed are reasonable but have nothing to do with the actual reason the shim/seat is in the pocket. The reason smaller bars do not have a shim/seat is because the smaller the thread diameter the less of an issue the Helix becomes.
Sr. Apps. Eng. Kennametal
Should that statement not be the finer the pitch the helix is less of an issue, .........cos it sure is on sub 1/2'' Acme and the like.
Absolutely. That guy wasn't thinking very clearly when he wrote what he did. For a given pitch, the larger the diameter the less the helix angle. For a given diameter, the greater the pitch the more the helix angle.
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