Duncans Metal Pages
Last updated: 13 Nov 2018


The Toolholder

The toolholder carries the toolbit to be ground and can carry out axial indexing operations.  It is fitted with an indexing plunger which allows angles every 15 degrees to be easily preset.

510: Tool holder

Milling 25-Nov-06: The book shows a couple of ways of machining the bore of the castings in the lathe.  It's easier for me to do it on the mini-mill to get holes exactly 2.000" apart.  On the right of the casting, the split cotter has already been bolted in place so it will be machined to exactly the same size as the bore.
Dressing This is the method used to machine the relief for the backplate.  I was going to turn between centres but thought the shock of the interrupted cut would cause a problem hence the bizarre method shown here.  The split cotter is bolted in and is being used to hold the casting to the 1" bar.

511: Nut

Nut 02-Dec-06: The knurled nut is 1-3/4" diameter and my stock of steel bar runs out at 1-1/2".  For this reason, the nut is being machined from some 1/4" thick steel plate which is being centred up on the lathe ready to drill and thread.
Nut To round the nut off and prepare for knurling, the square blank is being threaded onto item 512, the collet.  This still has the chucking piece attached which will be parted off after the nut is complete.

513: Index plate

Setup To get all the machining concentric, the index plate, nut, and collet will all be mounted on a 1" steel bar mounted in the lathe.  This is being held in the chuck at one end rather than between centres allowing the graduation to be carried out later using headstock dividing.
Turning With the nut clamped up tight, it's possible to take cutting forces as long as they are not too severe.

521: Fabricated holder

Some slight differences between this one and the drawing which originally shows a 9/16" square hole to take half inch tooling.  Almost everything here is 3/8" so the square hole has been reduced in size to 7/16" to suit.

Glued 15-Dec-06: The slot has been milled and some strips of 3/16" and 1/4" thick plate have been glued in to fill the gap.  5 steel pins of 5/32" diameter have been hammered and glued.  It looks a mess at this stage.
After grinding After a bit of cleaning up with the angle grinder, the holder is being drilled and tapped.
Finished All done and fitted to the toolholder body.

These pages are maintained by Duncan Munro.  All content on this site is Copyright ©2002-2022 Duncan Amplification.
Warning: These pages consist of images and descriptions of equipment which can reach high temperatures creating hazardous and potentially dangerous situations.  These pages should not be taken as a step by step guide on how to construct any items or carry out any particular procedure, nor should any references to safety contained herein be taken to guarantee safety in all situations.