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Member postings for John Haine

Here is a list of all the postings John Haine has made in our forums. Click on a thread name to jump to the thread.

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Thread: MT4 collets
08/04/2010 17:59:08
Well, maybe use a bit of tube rather than a broom handle.....the h/s bore is an inch, so max material diameter can't be more than say 7/8 allowing some meat at the back of the collet, so a bit of pipe 7/8 bore and 1 in od ought to go over the material and sneak up the back of the collet to knock it out.  Just looking at the Myford pattern collets, there seems to be some tricky dimensioning of the groove in the end that the closing ring engages in to make sure that the collet is held properly to extract it but can close up enough to be able to be fitted into the ring.  My worry is that if they are not hardened then closing them to fit the ring could deform them.
 
07/04/2010 22:15:29
Thanks for the replies....definitely free-cutting for me, and I won't bother with hardening.  As my lathe now has CNC this will be an interesting test of its capabilities.  I already have a set of Myford MT2 collets with the closing ring that threads on the spindle nose (with an adapter of course), and I plan to use a similar approach but with a larger ring so that long bars can be accomodated rather than use a drawbar.  I won't bother to make them self-extracting (like the MT2 ones are) but use my trusty bit of broom handle to knock them loose!  The most useful thing is knowing someone has successfully made them.
 
John.
06/04/2010 22:30:22
Thanks Richard - looks like making them is the best option then.  Any tips on how you went about it please - what material especially?
 
John.
Thread: sieg X1 micro Mill
29/03/2010 22:00:10
Thanks John - have sent PM with my email address.
29/03/2010 21:41:07
Peter, John (M), I'm just starting planning my X1 conversion, would be most interested in seeing pictures of how you have done it please.  In particular, I'm looking at the Arc ballscrews which look like a tight squeeze, so any advice on how to fit them would be very useful!
 
John.
Thread: Brazing torch
23/03/2010 20:45:03
For something simple, a Bernzomatic torch head with a yellow MAPP cylinder is excellent.  Far superior to all those cheap & not-so-cheerful butane torches that the DIY shops sell. 
Thread: Tony Jefree`s CNC conversion of the Myford ML7 Lathe (MEW May 2008)
20/03/2010 21:27:32
Actually John, flat earth has less to do with it than the cost of a new PXF leadscrew and matching nut if one cocks up, not to mention the difficulty of using a lathe to machine its own feedscrew.  Now if I had the space and cash for a second lathe....
Thread: Latest postings
20/03/2010 14:42:39
Gone again!
Thread: Tony Jefree`s CNC conversion of the Myford ML7 Lathe (MEW May 2008)
20/03/2010 14:38:17
I have taken a different approach with my PXF S7, as I didn't want to take any risk with Myford's engineering.  I have made a new feed screw, bracket and feednut, so the Myford components can be safely stored un-modified in case I want to revert.  I looked at the Myford screw and bracket and couldn't see an easy way to add ball bearings anyway (looking forward to seeing John's article therefore).
 
I use an M12 x 1.75 threaded rod (stainless) with an 8mm silver-steel stub let loctited in one end for the X-feed screw.  I bought suitable ball thrust races and a needle roller race from Arc with 8 mm bore.  All the bracketry is made up from aluminium sheet suitably machined.  Rather than the arrangement that Tony used the stepper is bolted to a sub-plate, spaced off a plate on the end of the new bracket.  I used 16 to 28 tooth belt timing pulleys to correct the feed to 1mm per rev of the stepper.  On the lead screew I used a similar approach to Tony but simplified the structure - there is no need for the sleeve that he put inside the plain P-bracket bearing to centre the roller races, these are just aligned with the dust caps.  I'd be happy to share photos of the approach if interested. 
 
I'm delighted with the results - despite using commercial studding for the cross feed screw (with a bronze nut) it is dead accurate as far as I can measure and no more backlash than Myford's original screw and nut.  I'm sure it will wear quicker but I can easily make a new one!
 
John.
Thread: TAYLOR MILLER Mk. 2
16/03/2010 19:49:52
Try the URL below for 3c collets...
 
 
This link might help for info on the mill...
 
 http://www.lathes.co.uk/taylormiller/
Thread: Drill chuck runout
16/03/2010 19:43:07
Robin,
 
Can't help with your query but would like to know more about what you are making, having an interest in this field.
 
John.
Thread: cutting morse taper
15/03/2010 14:24:57
3/4 inch, 19 mm minimum.  I have used the top-slide set-over method, works fine but you have to take great care setting it to a reference taper.  Definitely need support from the tailstock.  It's awkward avoiding the t/slide fouling the t/stock on the Myford, best use one of the long tool-holders to create maximum space.  Good luck!
Thread: Very basic milling questions
14/03/2010 09:49:54
Lathe is probably less rigid than a mill, so reduce feed rate/cut depth a bit.  Best advice though is to start slow and go by what sounds right.
Thread: Milling/Drilling machine advice
13/03/2010 10:23:22
I've got a VM-B but as I'm venturing into CNC and didn't want to start mucking around with Myford's stuff I also got a Super X1 from Arc Eurotrade. 
 
I haven't started converting it yet but I have used it for some small jobs and it's pretty good, and for an amazing price.  The articles in MEW recently showed how it could be improved which will at least increase its mass and damping (though not it's stiffness) so improving finish as long as you take small cuts.  I'm intending to convert it to belt drive as well.
Thread: Latest postings
13/03/2010 10:14:56
Fantastic!  Back to normal, many thanks David!
Thread: TurboCAD 3D thread
13/03/2010 10:12:44
Turbocad drives me mad whatever I try and do - I've given up on it and downloaded Solid Edge - seems much better.
Thread: Latest postings
12/03/2010 20:58:59
But the Latest Posts list is now only on the Home page, used to be on the right of each page!  Oh, more space for adverts, silly me.
Thread: MT4 collets
10/03/2010 19:48:12
Thanks for the responses.  I'd thought of MT3 but that only gives a limited increase on max diameter from my MT2 set, and the max size I have seen is 18 mm, not 3/4.  ER is another possibility but would need an adapter - nice to have collets that close in the native taper because much shorter overhang.  I think I might have a go at making one, see how it turns out.
 
John.
Thread: MT3 to 3C collet adapter article
01/03/2010 09:13:12
David, thanks for the clarification.
Thread: MT4 collets
28/02/2010 10:44:03
Does anyone know of a source for MT4 collets please?  I've got a large-bore S7 with MT4 taper, I can use MT2 collets with the MT2 adapter but these only go up to half-inch.  It would be nice to hold a few larger diameters, but I don't fancy forking out for a 5C chuck, so the ability to buy the off MT4 collet as required would be nice.
 
John.
<< First < Prev 270 271 272 273 274 275 276 277 278 279 Next > Last >>
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