The Workshop Progress Thread 2019

Thanks for the link John.

G.

Solved the problem with the table drive gearbox on my Senior mill. I had the gear lever between slow and medium! All working properly now.

Brian

I turned a 5" length of 5/8" steel into a pile of swarf and an Conrod, bit of a change from the usual designs as is most of this engine.

VERY neat Jason.

Brian

Lovely pile of swarf, where's the conrod? ( I'm only catty because I'm envious of the workmanship.)

Jim

Nice job Jason that's a very elegant conrod

Ian

Spent a few more hours pottering around putting things away and moving stuff around. I can actually move all the way from the shed door to the far end, with only a bit of fancy footwork near the door over the pile that needs to go to the tip tomorrow. I've gained a couple of square yards of floor space that I had forgotten were there!

Now where did I put the top of the bench.

At the beginning of July I fitted the longer table and leadscrew to my CDM10. The original table shown above has been sat on the bench annoying me, because I'm not sure what to do with it.

This is my home made (some might say bodged) tool grinder, made from a cheap bench grinder mounted on a lockable turntable (made from a car brake disc) together with a cheap cross vice. Any attachments to assist with grinding specific tools are held in the vice. This is not ideal, but has worked for years. My cunning plan is to remove the actual vice and mount the table in its place. I have taken measurements and this will involve removing about 4mm from the top of the cross vice dovetail where the vice was fitted. I also need to remove a total of 13mm from width the table and vice dovetails. This could be a long job involving a lot of winding because my mini mill can only take small DOC.

Edited By Anthony Knights on 10/11/2019 09:46:48

I have removed the vice assembly from the X-Y parts and mounted it on the milling machine and begun flycutting the top of the dovetails down.

After cutting the height down to what was required, I then used a dovetail cutter to widen the gap as much as I dared, hopefully without weakening it too much. I expect there will only be small stresses when grinding tools. This is the finished result.

The marks on the top of the right hand dovetail are where the original gib adjusters were. I did consider filling them with epoxy resin, but as they are not a load bearing surface, I decided not to bother. I'm not sure it would stay stuck in position anyway. The next job is to machine the dovetails on the on the old table.

Edited By Anthony Knights on 10/11/2019 09:48:14

Made a start of the flywheel that goes with the conrod I posted yesterday

That table looks familiar! I have just done the same improvement to my mill, and the old table is now sat on the bench annoying me too! Very good idea to use it like this. I think I'll hack off the dovetails on mine and make it into a mini pallet for my CNC mill. The table is big enough to drill lots of holes into it for various attachments.

Ian

Looks like Father Christmas came early Jason.

Jim

No that's another one of his engine designs, a Type B

Now that is one very cool (as they say these days) conrod and a lovely piece of machining , very nice indeed.

That engine certainly looks different Jason, I am trying to fathom the brass ball built into the flywheel. Is it an adjustable balance for the wheel its the only thing I could come up with.

p.s. or is it something to do with the timing.

Edited By Ron Laden on 11/11/2019 15:58:30

It's part of the governor, the other end of the bracket that the ball fixes to carries one of the ignition contacts. So as the speed goes up the ball and therefore the contact get slung outwards and this stops the spark so the engine slows and so on.

Thanks Jason, thats a neat idea is it unique to that engine or do others use that method.

Ron,

Unless you were referring to just models, opening the points or exhaust valve were used as govenor control on full size engines for several years until the fuel throttle controlled by govenor became more reliable.

Martin P

I don't think I have seen it on another model, the hit and miss engines tend to hold the exhaust valve open and others govern the throttle. I have done a couple of hit and miss engines that have a "battery saver" as part of the governor which also cuts the circuit so nothing gets to the spark plug when it is missing a beat but that is secondary to the exhaust being held open.

I clamped a 12mm silver steel bar in the front T slot of the milling machine to act as a guide to clamp the old table up against, ready for machining. Checked alignment with a dial gauge and as expected, it was spot on.

Milled the original dovetail off.

then cut the new dovetail to the width required. Next job is to make the gib strip