myford metric thread cutting

This topic has 11 replies, 9 voices, and was last updated 23 August 2013 at 09:06 by Geoff Rogers.

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13 May 2013 at 11:44 #119691
Matts BitsNBobs
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@mattsbitsnbobs
Hi can anyone tell me the issue number or month and year of MEW magazine that covered Derek Browns conversion of a Myford S7B to cut metric theads?

Thanks in advance,

Matt.
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13 May 2013 at 11:44 #22624
Matts BitsNBobs
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@mattsbitsnbobs
22 August 2013 at 05:09 #127523
Murray Tricker
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@murraytricker65189
Try Harold Halls index at http://www.homews-mew-index.co.uk
22 August 2013 at 09:02 #127537
Brian Wood
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@brianwood45127
Hello Matt,

The issue you want is June 2011 MEW 177.

Regards Brian
22 August 2013 at 09:06 #127539
Gray62
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@gray62
Issue 177 has the article Metric Screwcutting without tears by D.A.G Brown

Graeme
22 August 2013 at 09:11 #127541
John Stevenson 1
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@johnstevenson1
Seems a lot of work to me when you can do the same with one gear to be changed.
22 August 2013 at 12:15 #127555
Matts BitsNBobs
Participant
@mattsbitsnbobs
Thanks for the replies guys, will have a look later,

Regards Matt
22 August 2013 at 16:16 #127579
Geoff Rogers
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@geoffrogers81118
hi John,

I am sure you have said before, but which gear?

Geoff
22 August 2013 at 16:22 #127580
JasonB
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@jasonb
33 or 34 see here
22 August 2013 at 17:18 #127586
Phil P
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@philp
Posted by John Stevenson on 22/08/2013 09:11:19:

Seems a lot of work to me when you can do the same with one gear to be changed.

John

I have just been doing a load of metric threads on some collets and DA chucks for my Boley/BCA jig borer. I had just finished setting up the metric gear train as per the chart inside the cover when I remembered the 33/34 trick, so I changed it all back to that set-up and it works a treat, along with the Meek screwcutting clutch it is so simple and quick to cut metric now.

Phil
22 August 2013 at 19:02 #127598
Roderick Jenkins
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@roderickjenkins93242
I'm glad to see that there is a least one believer. The maximimum error in any thread using this system is 6 microns, that's 6/1,000,000 metres or 6/1000 millimeteres. Sadly, many people have unrealistic expectations of both their machines and their abilities and believe that any error is unacceptable – hence the oft quoted insistance that the only "correct" way to make metric threads on an imperial lathe is by using a 127 tooth changewheel. Relax, as Phil has shown; it's good enough!

cheers,

Rod
23 August 2013 at 09:06 #127650
Geoff Rogers
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@geoffrogers81118
thank you Roderick for the tables in the other post. just the job.

6 microns – easy to work to if you happen to have a couple of millon pounds worth of kit, but not what you would find in the avearge shed.

Geoff
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