Winner A Dividing Head By Wayne

[wayne.inspain]

I will remember it! I was surprised how much difference that small rise in temp made. The plate was turned around on the lathe and faced, I think it is still a bit thick and I might reduce it. I made some end float shims
next from a bit of bronze I had left over from a project I did some 25 years ago, I made a 70ft narrow boat which I made from scratch, the prop shaft was from an industrial potato peeling machine and the bushes were re-
worked by a friend of mine and used in the stern tube, and this is the off cut. It is about a mil big on the internal dia but it will be fine. They needed to be 2mm thick, turning them to thickness I needed to cut a grouve in some
soft jaws that were not soft and the blue chips burn!!

The shims are for the end float on the main spindle. This is the head as far as I have got to date.

I am not completely happy with the face plate it seems a little to thick and those marks on the rim look a lot worse on the pics than in life but they could do with a bit of a clean up. I decided
to go with four holes to mount the division disc so the discs couold be rotated to keep the no. of hole identifying numbers up right in the three most important positiond of the head, 0 45 and 90 degs.
The shim I have just made goes between the spindle clamping plate and the main barrel but bears on the shoulder of the spindle not the clamping plate.

 

[wayne.inspain]

Not sure what happened there every thing has jumped out of order but I am sure you can get the gist.

 

[Mark_f]

It looks great so far. Don't worry , that lesson will bite you again. Just this morning , I bored a spacer an put the shaft in it to check size. It slipped right in. I went to get a drink and came back . The shaft was stuck fast . The spacer cooled and locked on. I had to beat it out with a mallet.
.

 

[wayne.inspain]

It is amazing how a few degrees in temp can make a difference. Back from my travels and in to the shop, thought I might make the dividing handle
and arm next, one of my 3 pieces of brass was milled flat and square and a hole for the handle and a slot for the spindle, a bit of a round on the ends
and that was ready for a bit of a finish.

Next came my first attempt a threading on the lathe. I thought I would try a 1mm pitch thread on the part the is going to hold the indexing arm. A bit of brass turned down to 10mm and then threaded, it didn't come out too bad.

A hole through the middle then 2 flats milled to fit the indexing arm slot of 10mm.

 

[wayne.inspain]

This is what I have so far

 

[Mark_f]

This thing is looking great! I am very impressed.

 

[wayne.inspain]

Thanks Mark, It is nice to be back in the shop 2 weeks away too long.

 

[wayne.inspain]

I decided to do the sector arms next, not that I need them at the minute I just like turning brass. I squared up one of my pieces of brass on the mill, then center punched on the center line and put it in the 4 jaw chuck and centered on the center punch mark, I only have 1mm each side so I needed to start pretty close to the center of the piece.

Then bored 20mm hole through the plate them counter bored 38mm half way through the brass.

Out of the lathe and sanded to shape.

Then there was 2

I need to work out how I can chamfer the working edges and drill and tap for a clamping screw, bit of a clean up and they are done.

 

[Mark_f]

Beautiful work!

 

[LucknowKen]

Hey Wayne: Mark is spot on. Beautiful work.
Labor intensive, painstaking, beautiful work.
Thanks for the write up, lots of good ideas here.
lk