Tyneside Society
of Model and Experimental Engineers
Brian's Koppel
broken tap
boiler making
loco build 1
loco build 2
loco build 3
loco build 4
loco build 5
loco build 6
loco build 7
loco build 8
clock making
traction engines
Model Boats
stationary engines
Diamond Tool Holder

Peter Newby has kindly shared the information about his latest tool making project - A Diamond Tool Holder, but first a photo
of another of Peter's useful tools -great when working near bandsaw blades!


Diamond Tool Holder

Looking on various forums and talking to Brian, this seemed to be a wonder tool using standard ¼” HSS tool bits, which are far cheaper than
the current vogue for indexable carbide tools.

Eccentric Engineering sell a commercial item but at around £78 (plus £4 P&P) seemed a bit expensive, plus I wanted two – one for each of my lathes. 

The whole process to make the two holders plus a grinding jig, took about 3 hours.

grinding jig in use

Apart from the angles shown, none of the dimensions are critical.


Front view showing the 12 degree angle.

It is possible with a little care to make the holder with the right clearances such that the tool holder does not require to be moved from a
traverse cut to facing.

Traverse cut 0.187 deep                                                          Facing off 1.75" bar


The holder as shown fits the Myford Dickinson tool post on a Super 7.

The cutter works perfectly well on all materials – steel, brass, aluminium, plastics etc.

The holder shown is for a standard L/H tool; but a right hand tool can easily be made using the dimensions on the drawing making a mirror item
of the tool holder part.

I have used M5 threads as the cap screws are cheaply available, but use whatever you have.

Side view showing M5 clamp screw and welding

It will quite happily take a 3/16” cut with no undue load. On lighter cuts the finish is good & can be improved by rounding off the cutting corner
of the tool with an oil stone.

One cut 0.187 deep

All in, the time spent in making the tool has been worthwhile and is now left on both lathes as the tool of choice. Apart from form and parting
off tools, this is all you need.

I am told that this is not a new idea and goes back to the late 1800’s and was shown in volume 1 of the Model Engineer.

Peter Newby


Peter has produced 2 drawings to show dimensions for this very useful tool, they are available from the secretary (lindanic@sky.com) for a small donation
towards the new clubhouse fund of £3 (plus p&p). As well as the drawings the pack includes a hard copy of the photographs & description above.

Workshop tips & tricks
New clubhouse
TSMEE decades
Member's Projects
Stu's Boiler page
Archived pages
Photo Gallery
All Rights Reserved...