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MEW180 CAD Article

Shaping in a Lathe (Concept)

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KWIL11/08/2011 09:28:47
3681 forum posts
70 photos
Now that is all very good, certainly started off the discussion!!

There are of course plenty of small slotting tool designs aka shaper which fit on the toolpost and achieve the same result without racking the carriage up and down the bed. They use less effort to cut the metal because of that.
John Stevenson11/08/2011 09:43:31
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5068 forum posts
3 photos
Posted by KWIL on 11/08/2011 09:28:47:
Now that is all very good, certainly started off the discussion!!

There are of course plenty of small slotting tool designs aka shaper which fit on the toolpost and achieve the same result without racking the carriage up and down the bed. They use less effort to cut the metal because of that.
 
 
However these suffer from lack of rigidity and short stroke.
Moving the carriage will have more mass to it, which helps,
Down side is the gearing for the handwheel and rack is now a step up gear and not a reduction which will cause drag.
 
John S.
john jennings 111/08/2011 10:22:14
69 forum posts
It is all very pretty but it is basically a rough sketch of a possible lathe attachment.
 
Considering the task that the gadget is designed for it looks a little light in construction.
 
Only actually making it will show exactly what it can do and it seems gross waste of MEW pages which could well have had an outline of actual construction and performance.
 
While I am being grumpy the same analysis applies to the cutter grinder in a previous issue.
This although based on a made object avoided discussion of what seemed to be the main item of interest - the use of a Diamond faced wheel and any costructional detail.
mick11/08/2011 11:14:48
421 forum posts
49 photos
Hi Andy.
The ram will always return at twice the speed of the forward stroke. I can tell you from personnel experience that the Shaper was still a popular workshop machine well into the eighties, but mainly by those who knew how to use it to it's full potetional. I had one in my own comercial workshop into the late nineties. There is no better machine to achieve a totaly flat surface and can easilly be set up to cut key ways, only wish I had room in my workshop (shed) to fit one like yours in, thats of course if I could locate one, enjoy it, I've always maitained that god didn't rest on the 7th day, he invented the shaping machine!!!!
alan frost11/08/2011 11:45:12
137 forum posts
3 photos
Ady-your post at 6.00:12. Great computer graphics. What platform are you using ? Never come across one yet that simulates workshop grime so realistically altho I still prefer actual photographs.
I enjoyed the MEW article and thought it well worth while compared with some of the articles around issue 175 altho I would n't want to be the author if AD (Neebs) ever reads it ). "Watch out for the shaper boys" is sound advice given to new recruits on another well known site.

Edited By alan frost on 11/08/2011 11:49:54

Edited By alan frost on 11/08/2011 11:57:34

Keith11/08/2011 13:00:24
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25 forum posts
I think, as it is food for thought that it being published was fine. I read most of the articles in ME and MEW for ideas.
Keith
ady11/08/2011 13:43:52
612 forum posts
50 photos
The vertical shapers, which are usually big slotting machines, can also do accurate profiling work.
 
Studying some of these "old" machine tools can be a bit of an eye opener once you realise what they can do.
Michael Gilligan11/08/2011 22:54:41
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23121 forum posts
1360 photos
In response to KWIL's opening question.
... Yes, me for one!

Personally, I have no objection whatsoever to someone proposing a design; especially when the proposal has been so thoroughly worked-through, and is so clearly presented.

Sure, there will be things that each of us might wish to make differently; but that is true of most designs, whether or not the author has actually fabricated the thing.

If one cannot see how to "improve" on a proposal then one might as well buy ready-made. Extrapolate this and ultimately our hobby dies.

May I suggest that we could sometimes use the term "Workshop" [in the magazine's title] in the modern sense of a discussion group. ... Before forums like this existed, that is how magazines like Model Engineer often ran.
[for a prime example, check the protracted discussion about the Quorn]

MichaelG.
ady18/08/2011 12:01:33
612 forum posts
50 photos
An update from previous.
I fixed the spindle keyway...and the bang, although much reduced has moved to the slight play I have in my backgear so the rubber band damping system stays put for the moment until I come up with tight backgear or a proper damping system.
 
The other change is a couple of slideways I have put on the Adept table to improve speed and convenience for moving the job around.
 

 
 
Setting up on a shaper can take up a lot of time on a bigger job, it's quite fiddly and restricted.
With these slideways after setting the job square I can now whizz the job around with the shaper running.
Cuts have to be only slightly lighter than on the fixed table but it's not a heavy duty high torque unit in any case, and the added convenience of moving the secured workpiece about at will is a huge bonus.
 
This also means the unit now has access to two compound angles and works conveniently in three dimensions, so making a tapered jib from solid bar without resecuring the workpiece for example becomes possible.
 
...and did I also mention that It's a lot of fun too...it sure beats milling.

Edited By ady on 18/08/2011 12:08:15

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