Yet again! Metric screwcutting myford super 7

[David Crisp 1Participant @davidcrisp1]

I am lucky enough to have 2 super 7’s and other lathes however “she”…. Wants the stable back so I need to get rid of one of the myfords. I am about to start metric thread cutting and will rarely need to cut any other. One myford has a gearbox the other does not. I can’t decide which to sell. When I first bought one I believed “gearbox must be better” however now I will be practically 100 metric I can’t decide. Buy the conversion kit, or a set of gears (well, the 2 I haven’t got). What would others do?

[David Crisp 1Participant @davidcrisp1]

Metric threads myford AGAIN!

[Brian HParticipant @brianh50089]

I'd use Imperial!

[Roderick JenkinsParticipant @roderickjenkins93242]

If you can live with these "approximate" metric pitches then I would stick with the gearbox and buy the 33 and 34 tooth gears.

At least it makes selecting fine feed much easier than having to set up a gear train.

HTH,

Rod

[John Stevenson 1Participant @johnstevenson1]

And just by a fluke I have just finished a batch of the 33/34’s

[David Crisp 1Participant @davidcrisp1]

Brilliant gentlemen. Thank you. There was no way I was going to make a decision as I find it almost impossible to decide things like that. I did search for charts like that and couldn’t find them, also aprogram called boxfthreadp to see if that would help me decide without finding it. Yes Rod. Those tolerances are certainly close enough. I can’t imagine running any threads long enough for it to matter. Now to clean up and advertise the standard super 7!
Thanks again.
David.

[Neil LickfoldParticipant @neillickfold44316]

Thanks for the thread charts Rod. Neil

[nigel jones 5Participant @nigeljones5]

Rod – thanks for these, if M6x1 is coarse then what is M5x1.25? Pretty sure this is what I regularly use.

[MuzzerParticipant @muzzer]

fizzy – check it against this table. Where did you get that from?

[Nick HughesParticipant @nickhughes97026]

Another set of charts from a previous posting:- **LINK**

[David CParticipant @davidc]

Thank you all.

Gears arrived and all brilliant. Now I just need to convince her she does not need horse number 4 as much as I need two Myfords (which I know I don't really) but it's always handy to keep a spare.

[John HaineParticipant @johnhaine32865]

Could you harness Horse #4 to power one of the Myfords when the lights go out this winter? 1 HP is probably a nice amount to have…

[Swarf, Mostly!Participant @swarfmostly]

Posted by John Haine on 07/10/2016 09:48:30:

Could you harness Horse #4 to power one of the Myfords when the lights go out this winter? 1 HP is probably a nice amount to have…

I think it was Laurence (Lawrence ? ) Sparey who wrote 'much of the work we amateurs do on our ML7s is really too large for the machine'.

Your post had me wondering about the set-up required to turn the rims of a horse-sized treadmill!

Best regards,

Swarf, Mostly!

[KWILParticipant @kwil]

If you keep the Myfords they will cost you nothing, if you keep yet another horse, feed, vet's bills, farrier………

[John Stevenson 1Participant @johnstevenson1]

My brothers wife keeps horses and when I see one walking round the field, all I can see is 846 tins of glue

[David Crisp 1Participant @davidcrisp1]

She got another field shelter and 3 new stables!!!!
I see horsemeat on Christmas day!

[Author]

Posts