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Mega Adept

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Neil Wyatt21/08/2014 19:47:50
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OK, I've come clean and to the disgust of at least one bodger I have acquired a lovely blue Super Adept.

It's completely worn out in the spindle department, but the rest of it seems reasonably OK. I suspect high speed running with little lubrication, as the spindle was 2 thou undersize at the front bearing and the headstock had cracked during an attempt to compensate.

I'm not sure quite how radical the rebuild will be, not CNC, but I do want to see if it can become a back-geared screwcutting machine.

So, here is what I acquired from fellow forum member Steve. He feels he let it go cheap, I think I was ripped off. Or did I think I got a steal and he felt he'd asked too much? With so much confusion, it was probably a fair price - certainly not the silly money you see on Ebay.

eds bench 1.jpg

As you can see, it looks pretty and it was clean, but it's clearly had a busy life.

The first mod will be a new headstock top replace the cracked one. First part of the design process, is the spindle and an excuse for me to get to grips with Turbocad 21 for more than just opening author's files:

spindle.jpg

OK, I obviously need to set the number of facets for 'spin extrude' to more than the default 14, but considering! I also need to be aware that a clockwise extrude in a negative direction gives a left handed thread!

In short the new spindle will have a taper bearing at the front and plain at the back, with a hardened thrust washer against the front of the rear bearing bush. Both bushes will be Colphos 90.

Hopefully we will get beyond my first clumsy steps in rendering!

Wish me luck!

Neil

Michael Gilligan21/08/2014 21:09:55
9272 forum posts
399 photos

Neil,

  1. It will be interesting to see how you handle the screwcutting arrangement.
  2. Can you show some dimensions on the spindle drawing, please.

Very pleased to see you having a go at this.

MichaelG.

Michael Gilligan21/08/2014 22:04:54
9272 forum posts
399 photos

One way of doing [1] is pictured here

Click on the thumbnails for some excellent pictures; and click again to zoom in.

... "inspirational" ...

MichaelG.

Edited By Michael Gilligan on 21/08/2014 22:06:38

Saskatoon Model Engineering Society05/10/2014 16:26:02
13 forum posts
2 photos

Mega Adept project.

I have one.

http://saskatoonmodelengineers.webs.com/apps/photos/photo?photoid=195709953

http://saskatoonmodelengineers.webs.com/apps/videos/videos/show/12035932-making-skew-gears

It will be the subject of an article in the next issue of Machinist Workshop magazine.

Good luck with your project. I'm quite satified with mine. If I were to do it again I would use a variable speed motor (about 100 watts) and a two speed toothed belt drive with quite a large difference in the speeds....say about 4-500 rpm max in low and 1500 or so in high.

Howard Lewis09/10/2014 23:28:14
614 forum posts

My Adept came without the pulley on the Mandrel.

It is now painted dark (Prussian) blue.

Can anyone, kindly, let me have details of the pulley, please? Diameters (pitch line or OD, and groove angle?)

Am likely to make two, one for the motor, and one for the mandrel.

Am wondering about using something like a round polyurethane belt for the drive, as an alternative.

May be used a for light work, when for some reason it is not convenient to take work out of the big lathe.

Any comments/experiences Please?

Howard

Edited By Howard Lewis on 09/10/2014 23:29:05

Saskatoon Model Engineering Society10/10/2014 02:06:28
13 forum posts
2 photos

The original puleys had a vee angle of almost 65 degrees which is far too much. Even a round belt will slip. I made a three step pulley with vee angle of 30 degrees included. (picture in the links above).

I think the best would be a two step pulley with as much difference between the speeds as you can fit in and a variable speed motor.

Round poly belting is fine. There are two types.....the green is better than the orange because it is not as stretchy. It is difficult to make joints that last though.

Michael Gilligan10/10/2014 08:05:53
9272 forum posts
399 photos

Neil,

You've gone awfully quiet on this 'blog'

I hope you haven't been gagged. secret

MichaelG

Michael Gilligan10/10/2014 08:25:12
9272 forum posts
399 photos
Posted by Howard Lewis on 09/10/2014 23:28:14:

May be used a for light work, when for some reason it is not convenient to take work out of the big lathe.

Any comments/experiences Please?.

.

Howard,

Have a look at Roderick Jenkins' post on this previous thread

... very tidy installation of a Sewing Machine Motor to drive his Arrand milling/drilling spindle.

MichaelG.

Neil Wyatt10/10/2014 08:33:29
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Hi Folks,

This is going very slowly (I haven't cut metal yet) because I realise it's a one-way trip and I don't want to end up with a pile of scrap.

@Howard

Pulley angle here is 74 degrees. I imagine there is much variation and suspect the v-tool used to cut them was ground by eye

Outer diameters are 1.984" and 1.479". I suspect they are 'cleaned up 2" bar and the nominal sizes would be 2" and 1 1/2"

Pulley widths are about 5/16" the larger pulley has two flanges and is marginally wider. Boss width is roughly 3/8" and just over 1" diameter.

I doubt any of these dimensions were checked with a micrometer, they look like rule dimensions to me, which is all they need to be and fits with the need to knock them out by the barrowload.

@Saskatoon

That looks a nice, pretty original restoration. I don't understand what's happening with teh skew gears fiully, can you explain?

Neil

Michael Gilligan10/10/2014 11:08:55
9272 forum posts
399 photos

Fellow iPad users ... be aware that the skew-gear video requires Flash [and therefore cannot be viewed on the iPad]

I haven't checked yet; but I think this may be the same video, on YouTube.

MichaelG.

Mark P.10/10/2014 13:20:00
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507 forum posts
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Very nice Neil, similar to my Flexispeed/Simat 101 project.

Neil Wyatt10/10/2014 16:01:20
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> Flexispeed/Simat 101

Super Adept on steroids

Neil

Robin King10/10/2014 16:12:23
59 forum posts

Neil,

just curious to know - have you read B Terry Aspin's (of Chuck fame) articles on how he upgraded/modified a Super Adept? IIRC it was serialised in ME in the early 1950's and well worth a look.

Robin

Saskatoon Model Engineering Society10/10/2014 19:41:24
13 forum posts
2 photos

Neil: Actually it is not an original restoration but an upgrade to make it into a useable lathe similar to what you are planning.

The only Adept parts left are the main bed casting and the tailstock casting. The headstock bearings were sawn off and new ones brazed on. The spindle has been enlarged to 1/2" diameter similar to the 1947 article you posted in the "101 things..." forum. It was originally a plain Adept but was "converted" to a Super by cutting the vee's on the bed. The carriage, cross slide, apron and leadscrew drive are all new design. Orginally I had no chucks so made a set of very short collets. I now use Sherline chucks with an adapter to the 1/2" nose thread. I was going to put in back gear and screwcutting capablilty but decided it wsn't worth the effort. If I need more torque (for threading with a die, for instance) I attach a wood disc to the outboard end of the spindle and hand crank it.

The skew gears are not lathe parts, they are the cam drive gears for Westbury's Aveling Road Roller (ME-1938). Just an example of what the lathe is capable of. The fixture is based on an article in Model Engine Builder magazine and holds the gear blank at the proper angle to cut one tooth at a time. I didn't think the Adept would be capable of the job but it did it quite well.

..and yes, Micheal Gilligan, it is the same lathe as on you tube but that is a slightly different video done by someone else. I was demonstrating the gear cutting at a show.

To anyone....if you are going to make new pulleys, do NOT duplicate the wide Vee angle of the originals, it won't work. Use a Vee of 30-40 degrees instead. This advice from the master himself, George Thomas, in designing his "Pillar Tool".

Michael Gilligan10/10/2014 21:45:09
9272 forum posts
399 photos
Posted by Saskatoon Model Engineering Society on 10/10/2014 19:41:24:

The fixture is based on an article in Model Engine Builder magazine and holds the gear blank at the proper angle to cut one tooth at a time. I didn't think the Adept would be capable of the job but it did it quite well.

..and yes, Micheal Gilligan, it is the same lathe as on you tube but that is a slightly different video done by someone else. I was demonstrating the gear cutting at a show.

.

Thanks for that; I've just fired-up the Mac and watched your video too.

Must see if I can locate a copy of that Model Engine Builder magazine article.

MichaelG.

.

Edit:   Well, at least I've found a reference.

Edited By Michael Gilligan on 10/10/2014 21:48:38

Saskatoon Model Engineering Society10/10/2014 21:51:03
13 forum posts
2 photos

The relevant issue is Model Engine Builder issue #16 March/April 2008. There is a video of the engine running on the SMES website....saskatoonmodelengineer.webs.com

Neil Wyatt10/10/2014 21:55:04
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Thanks Sask. It does look rather nice!

Robin,

Another Canuck has kindly kept me topped up with a full set of reprints of all the Adept articles he can find, including 'Chuck's.

Neil

Neil Wyatt12/10/2014 18:55:36
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Ha! Real progress with the new spindle. Satisfying to see my 4" chuck really does spin a bar within 0.001"TIR at 4" from the chuck and I'm getting parallel to less than half a thou over that distance (not critical though as the only long bearing surface is the 1/2" diameter section the pulley will spin on.

Now I have to resharpen a screwcutting tool to 55 degrees, then out with the mandrel handle..

Neil

Bazyle12/10/2014 23:11:13
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3132 forum posts
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4in chuck surprise I thought these would only use about 2 1/2 .

What size motor is suitable?

Neil Wyatt13/10/2014 13:43:10
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> 4in chuck surprise I thought these would only use about 2 1/2 .

No problem at all, I just need to make the gap about 2" wider

I have the 1/3 hp Hoover that was a stopgap on the bigger lathe for a while. Hugely oversized, but as the belts will slip if overloaded it can't do any harm.

Neil

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