myford metric thread cutting

[Matts BitsNBobsParticipant @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.

[Matts BitsNBobsParticipant @mattsbitsnbobs]

[Murray TrickerParticipant @murraytricker65189]

Try Harold Halls index at http://www.homews-mew-index.co.uk

[Brian WoodParticipant @brianwood45127]

Hello Matt,

The issue you want is June 2011 MEW 177.

Regards Brian

[Gray62Participant @gray62]

Issue 177 has the article Metric Screwcutting without tears by D.A.G Brown

Graeme

[John Stevenson 1Participant @johnstevenson1]

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

[Matts BitsNBobsParticipant @mattsbitsnbobs]

Thanks for the replies guys, will have a look later,

Regards Matt

[Geoff RogersParticipant @geoffrogers81118]

hi John,

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

Geoff

[JasonBModerator @jasonb]

33 or 34 see here

[Phil PParticipant @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

[Roderick JenkinsParticipant @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

[Geoff RogersParticipant @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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