[SEL] Drawbar/Turntable Trailer

[Listerdiesel]

A few of you may remember our questions regarding the brakes that we
were going to use on the new trailer/RV that we are building.

Well things have moved along a tad, we expect to start welding the 6.5
metre (21ft) step-frame chassis next week.

Since last year-end we have got together all the bits and pieces that
we need, 3 axles, 3.5ton coupling, wheels/tyres and so on.

3 sheets of 21mm (13/16") honeycomb sandwich was collected a few weeks
ago for the floor and internal divider, heavy-duty checker plate for
where the engine trolley sits and so on.

We bought a damaged caravan last weekend to we can break it for the
bits we need, shower, cooker/fridge etc etc.

Tonight we collected a couple of hundredweight (1cwt = 112lbs) of new
304 and 316 stainless blanks for the front pivot pin and bearing
support.

Our little 5" lathe would probably baulk at that, especially in 6.75
diameter bar slices, but we were pleasantly surprised at how well it
coped. We used a carbide tool, DCMT replaceable tip type, and some
high-sulphur (sulfur) cutting oil for when we had to put a 20mm drill
through the final 14mm thick blank. We had a fair bit of waste as the
slice was 'wonky', but all in all we were pretty please.

Pictures of tonight's activities are here:

This is the next largest piece, this is for the safety retaining cap
on top of the pivot pin. This is 304 stainless and 5.75" diameter.
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer29.jpg

The interrupted cutting didn't cause any problems, we had a used tip
in the holder and it went well. The degree of out of true can be seen
in the next two pictures as we gradually bring the face true.
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer30.jpg
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer33.jpg

The tool holder is only 10mm square and the tip is small, pictures
following show the tool and tip.
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer31.jpg
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer32.jpg

Eventually it got to the point where we had only a small area left.
and then it was gone.
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer34.jpg
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer35.jpg

Turned it over and started on the other side....
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer36.jpg

Had to put a 20mm hole in the centre, which was a bit scary, but a new
10mm pilot (after centre drilling) went through fine, we had some
high-sulphur cutting oil to use and it certainly did the job. Even the
20mm drill went through with nice swarf coming out as we drilled. No
trouble at all.
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer37.jpg
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer38.jpg

Then we put a bit of M20 studding into the 3-jaw chuck with a nut to
hold it behind the jaws, and put the disc on to face the rim.
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer39.jpg
http://www.stationary-engine.net/Forum/Images/Uploaded/DBTrailer40.jpg

I'm going to have a go at one of the larger pieces tomorrow, now that
I know the lathe and tooling can cope. Speed was the slowest it would
go down to without engaging back gear, it is a 5" centre height Raglan
Littlejohn lathe.

Peter
-- 
Peter A Forbes
Email: listerdiesel at gmail.com
http://www.oldengine.org/members/diesel
http://stationary-engine.co.uk
http://www.oldengine.co.uk