The Workshop Progress Thread 2019

[Howard LewisParticipant @howardlewis46836]

Wish that i had the skill and patience to do that sort of thing!

Excellent work!

Howard

[mechman48Participant @mechman48]

Superb work on those wheels Richard, a lot of elbow grease gone into the finish by the looks of it.

George.

[John HinkleyParticipant @johnhinkley26699]

It's been a while and slow progress, but progress it is …..

All the gear blanks for my 5-speed transaxle gearbox had been made, as have the input and ouput shafts, gear hubs and spacers. The output gears need the dogs machining and of course there is going to be a monumental gear cutting session coming up. I've been waiting until all the gear blanks were finished until setting up the rotary table. I had to alter the ratio of 3rd gear slightly as I can't obtain a 28 tooth pattern with my rotary table set up but it made little difference overall. Below are a couple of pictures from the album:

The gear internals so far, with some finishing still to do:

The same parts, loosely assembled. To give some idea of scale, the shafts are 201mm in length.

I am awaiting delivery of some 10mm thick perspex sheet to use as the casing faces for display of the finished workings. I'll post further pictures of progress later. Much later.

John

[mechman48Participant @mechman48]

… Then I took delivery of the engine frames from Model Engineer’s Laser.

Do you have a link for these people; I have a pair of frames that will be a long & tedious job by hand so was looking at laser cut. I have a pair that were laser cut by a friends previous work place but only in 3mm stainless; their machine will not cut small cross members ( 3mm wide ), it just blasts them away, so he says ?

George.

[John HinkleyParticipant @johnhinkley26699]

George,

The site I think you're after is:

Link

You will have to supply a dxf file of the part you want cut and the owner will tell you whether your requirements are possible. I have used this service and found them excellent to deal with and very reasonably priced.

John

[Brian HParticipant @brianh50089]

Finally got the rebuilt motor back in my Tom Senior Major Mk 2 ELT and connected to an inverter. It runs nice and quiet although it's only on a slow speed while the new and the newly packed, bearings are run in.

The only problem is that, although there is drive to the table drive gearbox, there is no output. Hopefully something simple but it will have to be taken apart. I'm hoping it's just a shearpin or something.

Brian

[mechman48Participant @mechman48]

Posted by John Hinkley on 09/11/2019 16:55:21:

George,

The site I think you're after is:

Link

You will have to supply a dxf file of the part you want cut and the owner will tell you whether your requirements are possible. I have used this service and found them excellent to deal with and very reasonably priced.

John

Thanks for the link John.

G.

[Brian HParticipant @brianh50089]

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

[JasonBModerator @jasonb]

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.

[Brian HParticipant @brianh50089]

VERY neat Jason.

Brian

[Jim NicParticipant @jimnic]

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

Jim

[Ian Johnson 1Participant @ianjohnson1]

Nice job Jason that's a very elegant conrod

Ian

[Mark RandParticipant @markrand96270]

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.

[Anthony KnightsParticipant @anthonyknights16741]

 

 

 

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

[Anthony KnightsParticipant @anthonyknights16741]

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

[JasonBModerator @jasonb]

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

[Ian Johnson 1Participant @ianjohnson1]

Posted by Anthony Knights on 10/11/2019 09:29:10:

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.

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

[Jim NicParticipant @jimnic]

Looks like Father Christmas came early Jason.

Jim

[JasonBModerator @jasonb]

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

[Ron LadenParticipant @ronladen17547]

Posted by JasonB on 09/11/2019 20:08:32:

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.

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

[Ron LadenParticipant @ronladen17547]

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

[JasonBModerator @jasonb]

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.

[Ron LadenParticipant @ronladen17547]

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

[martin perman 1Participant @martinperman1]

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

[JasonBModerator @jasonb]

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.

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