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denham junior mk2

missing bits

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peter briggs 124/02/2016 21:59:50
5 forum posts
5 photos

hey guys

just joined and already need help.

i bought a denham junior mk 2 last year and its missing its screw cutting dial.

i know i probably will not be able to buy one so i was wondering if any off you have some pics or drawings so that i can make one? i know its a long shot but im pretty stuffed without it.

also does anyone have a manual for one of these??

regards

peter

Ady125/02/2016 11:37:43
avatar
2425 forum posts
318 photos

lathes.co.uk may have a manual

A dial simply shows you the relative position of the leadscrew and wouldn't usually be a problem on most hobby lathes, however you have rather a fine beast of a machine which has much inbuilt automation

I have put a couple of ME articles here

There was an excellent build article I read about years ago which included two different engagement nuts for different threading issues... but I'm buggered if I can remember where I read it...

John Baguley25/02/2016 12:12:28
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361 forum posts
39 photos

Hello Peter,

This is the dial fitted to mine:

screw cutting dial 1.jpg

I don't think it's an original part though as it looks homemade. I've had a look at the manual and there is no mention of a screw cutting dial so possibly the lathes didn't have one when originally built. I would expect one fitted at the factory would have had a cast body.

It looks pretty easy to make one. Couple of bits of bar soldered or welded together, with a spindle, dial, and gear wheel.

John

Just had another look at the manual and there should be a leadscrew guard that bolts onto the end of the apron where mine has the dial. That was obviously taken off and lost when the dial was fitted.

Edited By John Baguley on 25/02/2016 12:14:42

Edited By John Baguley on 25/02/2016 12:23:41

peter briggs 125/02/2016 12:33:15
5 forum posts
5 photos

hello john

thanks for the pic, i expected it would be there, mine has a cast shield around the lead screw which screws to the saddle, i think it is incomplete and would probably be the original.

how many increments does yours have ? 8?

only problem i have is no gear cutting equipment.

regards

peter

peter briggs 125/02/2016 12:33:46
5 forum posts
5 photos

hello john

thanks for the pic, i expected it would be there, mine has a cast shield around the lead screw which screws to the saddle, i think it is incomplete and would probably be the original.

how many increments does yours have ? 8?

only problem i have is no gear cutting equipment.

regards

peter

peter briggs 125/02/2016 12:34:15
5 forum posts
5 photos

p.s any chance of a copy of that manual?

John Baguley25/02/2016 13:45:20
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361 forum posts
39 photos

Hello Peter,

Yes, it's got 8 divisions. You might be able to get a suitable gear ready made or perhaps adapt a complete unit from a lathe with the same size leadscrew (4tpi) if there is one.

Will send you a pm with regard to the manual.

John

Paul Langford06/01/2017 22:47:12
9 forum posts
5 photos

Hello guys i am new on the forum as i have aquired a denham junior MK2 (keighley lifts) lathe and i`m currently in the process of cleaning it up and getting it ready to run.

It has a 1hp single phase motor and all the capacitors are blown so a new motor will be required. Do you think a replacement 1HP motor will be ok as i doubt if the motor that is on it is original even though its very old.

Also is there any chance of a copy of a manual if someone has one.

Many thanks

Paul

Chris Evans 607/01/2017 09:39:07
597 forum posts

Paul, I have not seen one of these lathes but suggest you look at three phase motor and VFD if the budget will run to it. Better power from the three phase and control of revs from the VFD. I have run a cheap £90 Chinese VFD on my Bridgeport mill for three years with no trouble.

Phil Whitley07/01/2017 20:59:45
461 forum posts
51 photos

You should be able to replace the capacitors for less than £20 the pair, that would get you going cheaply for now.

Neil Wyatt07/01/2017 21:41:54
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Moderator
8504 forum posts
464 photos
54 articles

Welcome to the forum Paul.

Your first step should be cleaning the old motor, getting the insulation checked and replacing the capacitors to get you up and running.

As others suggest in time a 3-phase motor with VFD drive is a great idea for almost any lathe.

Neil

Paul Langford07/01/2017 22:29:55
9 forum posts
5 photos

Thanks for the reply`s guys.

Dont think the original motor is worth getting new capacitors for as it looks well passed its sell by date with the insulation on the wiring all disintegrating.

It has 4 capacitors 30 MFD in parallel and they all say start on them so either they are wrong and thats why they have blown or they add up to 120mfd as a run capacitor and it has windings for the start.

either way it looks so bad i just didnt want to waste any money on trying to get it going when the windings themselves may well have failed on the insulation and thats why the capacitors blew.

Seems a new motor would be a more cost effective way to go forward.

 

Edited By Paul Langford on 07/01/2017 22:39:59

Paul Langford12/01/2017 22:58:17
9 forum posts
5 photos

here`s a before

img-20161025-wa0000.jpg

Edited By Paul Langford on 12/01/2017 23:04:18

Paul Langford12/01/2017 23:04:46
9 forum posts
5 photos

Here`s WIP

dsc_1078.jpg

Paul Langford16/01/2017 22:44:46
9 forum posts
5 photos

Bit more progress today and well pleased with how its going

dsc_1082.jpg

dsc_1083.jpg

Ady117/01/2017 00:36:22
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2425 forum posts
318 photos

Well done you.

Took me around 2 years to get my Drummond sorted and to really understand it

Brian Oldford17/01/2017 12:06:00
188 forum posts
4 photos
Posted by Paul Langford on 12/01/2017 23:04:46:

Here`s WIP

dsc_1078.jpg

Were that my shop the first thing to go would be that bottled gas heater. I wouldn't want to undo all that good work with corrosion from condensation having made a good job of cleaning up that fine lathe.

Scrumpy17/01/2017 15:06:16
avatar
82 forum posts

You deserve full praise for the work you have done so far another lathe being brought back to life ,

I am in the process of restoring a Boxford lathe from 1951/2 that was neglected for 10 + years but with help from many people on this forum I'm getting there good luck

Emgee17/01/2017 15:54:12
455 forum posts
149 photos

Great job being done there Paul, is the vertical member supporting a central lengthwise support ?

Emgee

Paul Langford17/01/2017 19:14:50
9 forum posts
5 photos

Cheers for the comments guy`s

The main table frame is large angle steel and there is a plywood top and bottom shelf. Then there is a steel drip tray fixed to the top which the lathe bed is mounted to. The vertical support i believe was for a drainage container to be fixed to as there is a drain point in the bottom right hand corner.

Overall its very solid and weighs an absolute ton.

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