Clarkson Mark 1 Tool and Cutter Grinder - Making Adapter Bushes To Hold End Mills And Other Cutters






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This page details the process I use to make metric adapter bushes.
These adapter bushes are similar to those in the catalog - imperial adapter bushes 1/4inch to 3/4inch Part Numbers 92607 to 92611
The adapter bushes are simple, easy, and quick to make.





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ADAPTER BUSHES


↓ I used off the shelf 1 inch diameter BMS bar to make the adapter bushes.
Using off the shelf 1inch diamter bar reduces the number of operations in the process.
The Clarkson 3/8th adapter bush that is being copied is on the right.
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I lost a few pictures here.

For a new adapter bush, a piece of 1 diameter inch BMS is cut to 1.75 inches long.
The ends of the new adapter bush are faced in the lathe, and the adapter bush is left long.
The 12mm adapter bush is drilled through with an 11.8mm drill bit. The bore will be reamed later.
The 10mm adapter bush is drilled through with an 9.8mm drill bit. The bore will be reamed later.
A mark is made 10mm from one faced end of the adapter bush, and a 9.8mm cross hole is drilled.

↓ I reamed the cross hole with a 10mm reamer (it looks neater).
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↓ The new adapter bush with the completed cross hole is on the left.
The new adapter bush is too long and needs to be turned to a length of 1.5 inch.
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↓ The new adapter bush is turned to length and reamed to size in the lathe.
Note that the bore is reamed after the cross hole is completed. Boring the cross hole leaves a burr in the bore, and running the reamer through, AFTER the cross hole is made, will remove this burr.
The sharp edges are relieved with a file and emery cloth.
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↓ The 12mm adapter bush is completed.
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↓ The 10mm and 12mm adapter bushes are completed.
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↓ An adapter bush being inserted in the 1 inch holder.
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