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Myford Connoisseur Lathe

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Steve Talbot 117/07/2011 10:53:43
31 forum posts
Hi,
Can anyone tell me if a METRIC Myford Connoisseur lathe has an imperial 8tpi leadscrew and if so does a metric conversion quadrant and gears have to be used to cut metric threads?
 
If a quadrant is required is this identical to that used on an imperial Super 7B to cut metric threads?
 
Any information would be appreciated.
Stub Mandrel17/07/2011 13:03:03
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4318 forum posts
291 photos
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If it has an 8tpi leadscrew you only need a 63-tooth changewheel to be able to do metric threads.
 
Neil
Steve Talbot 117/07/2011 13:53:26
31 forum posts
Thanks for replying Neil,
Would a metric quadrant be necessary on a metric connoisseur?
Regards,
Steve
chris stephens17/07/2011 14:34:03
1049 forum posts
1 photos
Hi Steve,
When I was first demonstrating on a "Metric" Myford at recent MEXs, I found it surprising that although the dials were metric the gearbox was still in TPI. Should one have seen the writing on the wall, that Myford could not afford to design and make a Metric gearbox?
If Myford had not been so cash strapped, and perhaps also stick-in-the-muds, maybe they could have offered an ELS (electronic lead screw) for their machines, which would have made the IMP/Metric issue redundant.
chriStephens
John Stevenson17/07/2011 14:41:17
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5068 forum posts
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Steve,
To be perfectly precise on the pitch then the answer is yes, you need the whole banjo and gears.
 
If you aren't working for NASA then you can get away with using a 33 or 34 tooth gear as the input and still keep the fine feed etc.
 
The 33 / 34 combination will do all common threads with only a slight error, probably not enough to be measurable in the home shop.
 
Simples ?
 
John S.
DMB17/07/2011 22:57:10
1585 forum posts
1 photos
I believe that SMEE used to have a Myford on loan to them for their MEX stand but M now gone, so what now? Presumably a member will bring his along.
chris stephens18/07/2011 01:27:35
1049 forum posts
1 photos
Hi John,
Indeed that was true but, now that they have gone, don't forget that ArcEuro kindly gave us a fully kitted Mini-lathe which we take to shows. At some of those shows we can even let beginners have a bit of hands on experience. Isn't that right Diane, I hope the kids enjoyed it.?
 
If one of the pre-owned machine dealers, who are going to Sandown this year, want to have one of their lathes demonstrated I am sure we could oblige.
chriStephens
ady18/07/2011 03:59:08
612 forum posts
50 photos
A digital system would probbly be better, especially when you need high accuracy.
 
Just cycle from imperial to metric as required.
An independent DRO would also take any backlash on the leadscrew nut into account and compensate for any additional wear in the centre of the leadscrew.
You could even measure the threadcutting tpi result of your machine down to around a hundredth of a millimeter, 5/10,000ths of an inch.

Steve Talbot 118/07/2011 09:36:29
31 forum posts
Thanks for everyone's comments, so it looks like the METRIC Myford Connoisseur lathe does need a metric banjo and gears.
 
But, does anyone know if a metric banjo and gears from a Super 7B will fit the METRIC Myford Connoisseur lathe.

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