Member postings for TomK

Michael

The hemisphere contains 2 ball races and has no weights added the friction on the tufnel base has enough friction to grip the hemisphere.

tom

The item is a Lushington No.1 Clutch Mandrel / Alignment Tool

link

Tom

I think you have bits missing which would solve the mystery as to what this tool is. I think its a bore gauge. This link may help

Tom

The shape of the jaw looks like it could hold a woodruff key.

Thought I would put a piece of tooling up I have almost finished. Just have to decide how to finish the jaws. There is more pictures in my album.

Tom

For those interested in the machinery handbook the 28th edition is free to download on the web

<edit as a publisher ourselves we don't want to encourage forum members to break other people's copyright>

Tom

Edited By Neil Wyatt on 28/02/2017 15:34:59

Joseph

You have a pm

tom

It is looks like a locating pin. There are pins used in jigs by tool makers very similar to it.

The arithmetic for dividing heads is to take the number of turns to do 360 degrees (40) or (90) Divide by the divisions required keep answer in fractions. For 13 divisions this would be:-

90/13 = 6 12/13

Multiple the denominator 13 by a number that gives a set of holes on a division plate you have and multiply the numerator 12 by the same number.

For the above example the 13*3=39 and 12x3=36

Therefore 6 turns. 36 holes on 39 hole plate

For 40 turn head 40/13 = 3 1/13 if you have 26 hole plate the

13*2 =26 1*2=2 therefore 3 turns 2 holes on 26 hole plate

Use 3 for 39 hole plate which works 13*3=39 and 1*3=3

Which = 3 turns and 3 holes on 39 hole plate.

Tom

Steve

I have repaired a few mercer clocks and yours looks very simmilar. Your problem could be 1 of 3 faults

1) stylis is loose (do not tighten with plyers unless you can grip pivot with modified plyers as the bearings will be damaged)

2) The ball ball bearings that support the stylis pivit requiire adjustment.

3) The ball bearings are damaged

Tom

Jimmie

The article was called "A pendulum Harmonograph" It was published in Model engineer in 1960

Vol 123 Number 3087 page 300

Tom

Jamie

There is some pictures in my album showing both set ups on how I milled a 8" x 6" 0.5" piece of gauge plate.

You have to get a rigid setup to mill it in the vertical but it can be done, I used 2 cubes an 2 angle plates bolted together. I very rarley use a vice when I milling parts I always try and clamp to the table or to angle plates or cubes

**LINK**

In the picture of the plate being cut the fly tool is held in a morse taper collet with drawbar this give a more rigid set up also more clearance cutter to table.

Graham

Looks like a bell target for air rifle shooting

Tom

Doug

There is a company in Glasgow the sells Er Collet straight shank chucks.

I have a couple of these and the material is tough but can be machined. I have not tried to machine the bore but the shafts can be machined.

Tom

Edited By TomK on 15/04/2014 19:47:21

Rod

I have sent you a PM

Mike

I have sent you a pm

Tomk