Newby machine help please

This topic has 36 replies, 14 voices, and was last updated 9 December 2019 at 20:59 by Michael Gilligan.

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11 February 2017 at 16:49 #283665
Russell Eberhardt
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@russelleberhardt48058
Posted by Scrumpy on 11/02/2017 14:08:13:

Hi I have looked and the manual again and I cannot see head or tail what Russell is talking about,

If you look at the table of metric feeds in the second picture in his album the pitches I quoted are the only ones that use the gear combination he said he has. Simple

Russell.
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11 February 2017 at 18:40 #283689
Marc Jonah
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@marcjonah71323
Thank you very much gentlemen, I really appreciate all your help.

Cheers

Marc
11 February 2017 at 19:04 #283693
Scrumpy
Participant
@scrumpy
Marc after checking on the lathe between the two leavers you will see it says threads per inch this means you can cut imperial threads 2 to 28 as long as you have gears 44 driver 44 driven with no other change you will need change wheels for metric threads for imperial threads on this chart I e leaver 1 leaver AC will give you 2 tpi leaver 5 leaver AD will give you 12 tpi hope this makes sorry I don't have any photos
11 February 2017 at 19:08 #283694
Marc Jonah
Participant
@marcjonah71323
Cheers scrumpy.
12 February 2017 at 10:09 #283758
Marc Jonah
Participant
@marcjonah71323
Ok, the OD over the teeth of the 60 is 5.647" or 143mm so am I correct in thinking 62/5.647? As that doesn't really match any size gear in davall. I can't see it matching any metric size either, any ideas?
13 February 2017 at 09:50 #283923
Russell Eberhardt
Participant
@russelleberhardt48058
Posted by Marc Jonah on 12/02/2017 10:09:10:

Ok, the OD over the teeth of the 60 is 5.647" or 143mm so am I correct in thinking 62/5.647? As that doesn't really match any size gear in davall. I can't see it matching any metric size either, any ideas?

That looks like 11 DP which is a bit unusual, even numbers being more common.

Russell
9 December 2019 at 04:36 #440840
Frank lyszkiewicz
Participant
@franklyszkiewicz91059
Hi Marc iv'e got a Mitchell there should be 12 gears in total one each of 30, 42, 44, 45, 46, 48, 57, 60, 63, 80 and two of 40, if you need a copy of the manual I can photocopy it for you regards frank
9 December 2019 at 08:43 #440849
Nicholas Farr
Participant
@nicholasfarr14254
Hi Marc, don't know if this is any help to you, but it looks like you have this model.

Regards Nick.

Edited By Nicholas Farr on 09/12/2019 08:51:54
9 December 2019 at 11:07 #440862
Mark Gould 1
Participant
@markgould1
This thread is nearly 3 years old. I doubt Marc is still following this.
9 December 2019 at 14:32 #440886
Marc Jonah
Participant
@marcjonah71323
Thanks gents, I’ve still got the lathe but haven’t used it much. I’d be very interested in a copy of the manual if you could though please?

marc
9 December 2019 at 18:10 #440934
Howard Lewis
Participant
@howardlewis46836
Two comments Sorry to be depressive.

To calculate the DP of the gears.

OD = (N+2 ) / DP So, for the 60T: 62 / 5.647 = 10.979. Which, as Russel said looks like 11DP. An odd number in both ways!

Since the dimensions form the lathe are all quoted in Imperial, I think that we can discount the gears as being Module types Plus the 6oT with an OD of 143mm would be a 2.3 module, which seems to be even more odd.

May I suggest rechecking the tooth count and the OD, in case the gear is actually a more normal DP?

If a complete set contains 12 change gears, and you have only 3, buying the remaining 9 is going to be expensive. Possibly as much, or even more, than you paid for the lathe. And then, IF they are correct width, they will need to be modified to provide the correct bore and to cut the keyway.

My suggestion would be to see if you can find a Model Engineering Society close by, with a kind member who would be prepared to buy cutters, (more than one is likely to be needed, probably three without checking, so you are looking at £60 -70 as a starting point ) and to cut you as set of gears,

Either way, whether or not the gears are a strange DP, it is going to cost a bit!

Howard
9 December 2019 at 20:59 #440957
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Howard Lewis on 09/12/2019 18:10:26:

[…]

May I suggest rechecking the tooth count and the OD, in case the gear is actually a more normal DP?

[…]

.

Wise advice, Howard

Although I would hope that a gear so boldly marked 60 would have 60 teeth; mistakes do happen.

**LINK**

Reply To: Mamod Fuel

MichaelG.

Edited By Michael Gilligan on 09/12/2019 21:01:32
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