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Old 02-07-2017, 05:58 PM   #471
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THREAD DROP IN DIALS.

It all depends on whether your lathe is metric or imperial. The drop in dials should be geared up for whichever one you have. The drop in dials on most metric machines also require a change of gear on the bottom of the drop in dial to cater for different sized threads.

If you want to cut a thread that is opposite to what your machine is, Imperial on a Metric lathe, then you usually use the permanently closed half nut technique and the same vice versa, using the reverse on the lathe to get you back to the start.

But also, sometimes on a metric lathe, to obtain certain threads shown on the threading chart, the permanently engaged half nuts are sometimes required.


John


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Old 02-07-2017, 06:09 PM   #472
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John - it's a metric leadscrew. 3mm pitch I believe. I have no extra gears for the dial chaser so whatever it's set for is fixed. At some point I'll do some measurements to get the ratio relationship between the leadscrew and chaser dial gear. It might well be like Rod said, it's keyed for imperial thread cutting.


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Old 02-15-2017, 08:11 AM   #473
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Default The drawbar is done

And a finished drawbar, again thanks to the finishing touch by Bruce.

[1] Blanks cut out from my pristine stock of 1215 steel
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[2] The M12 thread is cut on the lathe and 17mm round is drilled and reamed to 12mm and all ready to start assembly
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[3] Test fit looks good.
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[4] finally all together and the square end cut on Bruce's Luxcut. Original bar in the background.
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[5] A closer look at the thread. I'm a little bit proud of this one as it's a very clean fit in the M12 ER32 collect chuck and let's face it, I'm an absolute newbie at lathe work.
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[6] The first bit of work using the new bar. The virgin cut as it were.
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Old 02-15-2017, 09:09 AM   #474
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Nice work James!
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Old 02-15-2017, 11:44 AM   #475
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Quote:
Originally Posted by Roboguy View Post
Nice work James!
x2, I think I made mine in 2011 and to this day, I've only cut one other thread!
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Old 02-15-2017, 05:59 PM   #476
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That square was almost as complicated as the 4 tee nuts for the Bridgeport I don't have yet.

Now you can really start making things. no more mucking around with that welder



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Old 02-16-2017, 04:47 AM   #477
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Quote:
Originally Posted by bruedney View Post
That square was almost as complicated as the 4 tee nuts for the Bridgeport I don't have yet.

Now you can really start making things. no more mucking around with that welder



Bruce
He had to mention the Bridgeport - someones got cream on their whiskers I think.

When you get that monster and start cleaning it up I expect pictures. Remember cose there is


Anyway I like making sparks, sparks is fun and I need to make that new clever stand for the band saw.

And I need to start on that engine, and make that wrench for the mill, and start the improved grinding wrest, get all the old decrepit paint pails dumped, get the wife's car in garage .... and and and .... oh dear lord!!
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Old 02-16-2017, 04:49 AM   #478
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@Roboguy/@rodw - thanks gents. excellent fun making it even something so simple.
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Old 02-17-2017, 05:35 AM   #479
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Game plan is a plywood "box" with shelves and doors. Probably a couple of wide low profile draws at the top for holding cutters and chucks/collets.

But I need to leave a space for a box for CNC control electronics.
No I don't mean around the base of the stand, I mean around the mill.

I have mine enclosed on three sides, hell it would be four if I didn't have to stand there, and it does a great job of stopping chips from flying around the whole shop. Then I just need to sweep and vac the front side.

If I didn't having it enclosed the clean up would drive me nuts.
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Old 02-17-2017, 07:32 AM   #480
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Quote:
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No I don't mean around the base of the stand, I mean around the mill.

I have mine enclosed on three sides, hell it would be four if I didn't have to stand there, and it does a great job of stopping chips from flying around the whole shop. Then I just need to sweep and vac the front side.

If I didn't having it enclosed the clean up would drive me nuts.
Ah - got you. Thinking a shower curtain type setup to keep it under control. I don't have the room for something with rigid ends due to space plus the really wide table will pass over the end of the chip tray at the ends of its travel. Such an approach should keep the worst of the mess around the base the machine/stand.

Make sense?


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