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Drummond pre-B type lathe (1/4 scale)

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Ian Newman 103/05/2016 10:10:14
11 forum posts

Hi,

My new project is a 1/4 scale model of my own lathe - a Drummond Pre-B Type made in about 1910.

One of the conical headstock bearings has reached the limit of its adjustment, so I had the headstock dismantled to take dimensions to make a replacement. While the headstock was demounted and in bits I took the opportunity to make fully dimensioned drawings of the parts for future reference - and one thing led to another....

The obvious place to start is the bed. On the original, this is cast and to make a cast. Casting is not a process that I have access to, so I am going to mill/file the part from solid and fabricate some of the minor detail. Progress so far:

As you can see, I've a long way to go with this component...

Ian.

Ian Newman 104/05/2016 15:30:44
11 forum posts

Having frightened myself with the thought of trying to machine the bed, I decided to start with something a little easier.

I spent yesterday evening flycutting some small slabs of stock to the desired thickness and then cut the 'blanks' that will become the compound slide, the cross slide and the saddle and filing them to shape.

Compound parts:

I machined the dovetails in the saddle, drilled and tapped the gib adjustment holes and filed the saddle to shape:

Philip Rowe04/05/2016 16:12:34
170 forum posts
14 photos

Judging from the effort that you seem to be putting into this project I am assuming that you will be motorising this miniature Drummond. In which case you will have a very nice watchmakers lathe.

Phil

Michael Gilligan04/05/2016 17:52:38
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13559 forum posts
586 photos

Great project, Ian star

Please keep the progress reports coming.

MichaelG.

Hopper05/05/2016 03:07:42
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3651 forum posts
72 photos

Brilliant project! Keep us posted.

Ian S C05/05/2016 11:42:23
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7427 forum posts
230 photos

Rather than an electric motor, would you not perhaps use a foot motor, although small open crank horizontal gas engines were a thing used by some.

Ian S C

Neil Wyatt05/05/2016 12:35:13
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Posted by Ian S C on 05/05/2016 11:42:23:

Rather than an electric motor, would you not perhaps use a foot motor, although small open crank horizontal gas engines were a thing used by some.

Ian S C

Ten he could set up a complete 1/4" scale sweat-shop complete and recruit a gang of toddlers to power it

neil

Tractor man05/05/2016 20:07:15
426 forum posts
1 photos
Very nice start on your project. So nice to see the machines we use being modelled. Keep up with the updates. Mick
Ian Newman 107/05/2016 23:22:29
11 forum posts
Posted by Philip Rowe on 04/05/2016 16:12:34:

Judging from the effort that you seem to be putting into this project I am assuming that you will be motorising this miniature Drummond. In which case you will have a very nice watchmakers lathe.

Phil

Phil,

As you (and Ian) have noticed, the intention is to make a working machine. I started on the assumption that it would be a nice, simple, straightforward project - it is a simple lathe with a total of about 12 moving parts, it must be a 'piece of cake' compared to a Gresley A4.

But when you start looking at the detail of the task it sort of grows

All the best,

Ian

Ian Newman 107/05/2016 23:31:32
11 forum posts

Hi,

Today's progress - a bit of machining and drill/tapping to make the cross slide fit the saddle, and a little work with a needle file to shape the gib strip.

The parts (only one of the locating dimples has been drilled on the gib strip so far):

The cross slide fitted to the saddle:

Viewed from underneath:

The next challenge is to make a small Tee-slot cutter to produce the cross-slide Tee slots.

Ian

Ian S C08/05/2016 10:17:59
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7427 forum posts
230 photos

Even with an electric motor, it should be run from a line shaft with a fast and loose pulley, same as we had at school running the old Herbert lathes (1920s vintage).

Ian S C

Ian Newman 115/05/2016 21:25:59
11 forum posts

A bit more progress:

The feedscrew for the cross slide machined out:

I also cut out the cross slide front plate. After threading the feedscrew, the cross slide and saddle could be fully fitted with the front plate and feedscrew. A small handle was quickly filed up to allow the operation to be tested:

View underneath:

I also roughed out the headstock - milled/hacksawed from a block:

Michael Gilligan15/05/2016 21:31:30
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13559 forum posts
586 photos

That's looking great, Ian

MichaelG.

Neil Wyatt15/05/2016 21:52:35
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Moderator
16257 forum posts
679 photos
74 articles

Indeed a great project.

Hopper16/05/2016 12:04:14
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3651 forum posts
72 photos

That's neat. Keep on posting. Loving it.

Benny Avelin09/03/2017 09:57:30
80 forum posts
86 photos

How is it going with this very interesting project?

I have often entertained the idea of building a small machine, mill/lathe/shaper. If I would build one it would probably be a shaper and then I would make it large enough to be useful in cutting keyslots and such.

Chris Woodcock 214/03/2017 10:57:00
2 forum posts

This is indeed an interesting project and I also would be interested to know how it is progressing, particularly as I have two Drummond pre-Bs, one on an original treadle stand. When I needed to replace a small cast-iron component I carved a pattern in lime-wood and found a small local foundry (in Derbyshire). For a small charge they made me two castings which I was then able to finish off at home. Would this approach work with your quarter-scale lathe bed?

John Flack14/03/2017 14:53:26
168 forum posts

Could Ian's real interest be in making large scale pens????????😈😈😈😈😈😈😈😈

Tractor man01/04/2017 08:03:59
426 forum posts
1 photos
Now there's a possibility John lol.
Did you see the million dollar coin that has been stolen from a museum in Canada. I could put that next to my lathe and kid you on it's a miniature. If I had a spare couple of million to buy it that is. http://www.telegraph.co.uk/news/2017/03/27/giant-gold-coin-worth-almost-4-millionstolen-berlin-museum-dawn/
Tractor man01/04/2017 08:04:32
426 forum posts
1 photos
Ps how do I do links lol

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