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Does anyone know where I can source a Myford 34t change gear?

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Karl Challis17/04/2019 21:50:04
8 forum posts

Hi,

I'm needing a 33t and 34t change gear to allow for metric screw cutting.

The 33t seems readily available at a bargain £10 however the 34T I Can't seem to find anywhere.

If anyone has maybe purchased one before or may know of a link it would be appreciated.

TIA

Zan17/04/2019 23:12:23
98 forum posts
2 photos

Got mine at the Fosse from Myford/RDG. They had loads

clivel17/04/2019 23:45:16
282 forum posts
12 photos

I contacted RDG via their website on January 30th to enquire when they would have the 34t back in stock and got the following response:

"Thank you for the email we are out of stock for at least 8 weeks sorry but they will go straight back on the web site once in stock."

They haven't yet appeared, so you might want to try asking them as well, you can contact them here.

Clive

 

Edited By clivel on 17/04/2019 23:45:50

Hopper18/04/2019 00:55:34
avatar
3657 forum posts
72 photos

Put a WANTED ad on this site. I got several Myford gears to complete my set that way.

mgnbuk18/04/2019 07:48:37
509 forum posts
10 photos

I asked RDG about availability of this gear on the 26th March & was told "around 6 weeks" - so possibly mid May, though if a 30th January enquiry suggested "at least 8 weeks" maybe mid June ?

I had a look around the usual secondhand suppliers yesterday & couldn't find one. I have a "commission" to make a wood lathe chuck adapter for one of my wife's colleagues that has 3 and 3.5mm pitch threads, so both gears required.

Nigel B

Simon Williams 318/04/2019 22:23:48
399 forum posts
65 photos

Karl (OP), Nigel(mgnbuk)

Gents I have sent you a PM.

HTH Simon

Malcolm Jones 119/04/2019 07:34:43
13 forum posts
4 photos

I have been looking for a 34T change wheel for some time and I have considered making one.

Can any one tell me the diameter of the blank that I need please.

Malcolm

JasonB19/04/2019 07:39:42
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Moderator
16051 forum posts
1687 photos
1 articles

No of teeth plus 2 all divided by DP

(34 + 2) / 20 = 1.8"

Use a 14.5pa cutter

john fletcher 119/04/2019 11:08:11
524 forum posts

Have you tried HPC at Chesterfield 01246 268080 or Daval at Hatfield.0707 268536

JasonB19/04/2019 13:02:21
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Moderator
16051 forum posts
1687 photos
1 articles

Like most other off the shelf gears HPC and Daval do 20pa not 14.5pa.

Brian Wood19/04/2019 18:00:28
1942 forum posts
37 photos

Malcolm,

What Jason didn't add was that you need a # 4 cutter to make that gear. If you have the equipment you can borrow mine and send it back when you are done. It is a commercial size which needs a 1 inch diameter arbour.

If that is helpful send me an email with your contact details and I will make sure it is sharp before sending

The same offer applies to Karl Challis if you are able to use it

Regards

Brian

wood_y(at)btinternet(dot)com all lower case and be sure to include the underscore between the d and y

Nick Hulme19/04/2019 20:30:30
698 forum posts
37 photos
Posted by JasonB on 19/04/2019 13:02:21:

Like most other off the shelf gears HPC and Daval do 20pa not 14.5pa.

I've cut my own with off the shelf cutters, presumably the pressure angle for those didn't match either.
But they work perfectly well and since model engineers are so blase about variation metric pitches........ :D

JasonB19/04/2019 20:35:13
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Moderator
16051 forum posts
1687 photos
1 articles

Depends who's shelf the cutters came off, quite a few 14.5 pa cutters about particularly old second hand ones.

Karl Challis19/04/2019 21:17:26
8 forum posts

Brian.

Thanks for the offer for lending the cutter. However someone has kindly offered to make one for me. And all other help, muchly appreciated.

Curious as to the reason the particular 34T is so hard to get? Is it a really uncommon size?

lfoggy19/04/2019 21:40:38
70 forum posts
5 photos

Try finding a 48 tooth gear. They are even more difficult to get hold of !

Pete Rimmer27/04/2019 20:39:59
400 forum posts
18 photos
Posted by lfoggy on 19/04/2019 21:40:38:

Try finding a 48 tooth gear. They are even more difficult to get hold of !

48T is not part of the normal set. What is it required for on the Myford?

john lavin27/04/2019 21:37:58
9 forum posts

Hi I am looking for a bit of info relating to a Aud Boxford lathe I am renovating, while stripping I damaged the left hand threaded screw in the centre of the clutch knob I think that is what it's called I need to know the size and thread please .

Roderick Jenkins28/04/2019 00:30:53
avatar
1776 forum posts
456 photos
Posted by Karl Challis on 19/04/2019 21:17:26:

Brian.

Thanks for the offer for lending the cutter. However someone has kindly offered to make one for me. And all other help, muchly appreciated.

Curious as to the reason the particular 34T is so hard to get? Is it a really uncommon size?

33 and 34T were never part of the Myford change wheel set. All conceivable threads were available by other combinations. Other correspondents have commented in the past that the new Myford owners had no conception of what they could be used for but they do seem to have cottoned on to the demand. I wonder if John Stevenson made a batch for them, which have since run out. It is also worth bearing in mind that sales of these "cheat" gears would detract from sales of the official Myford metric conversion set.

Rod

Brian Wood28/04/2019 11:08:45
1942 forum posts
37 photos

Hello Rod,

At the risk of sounding rather stuffy, the "cheat" gears as you put it do save a lot of time and leave the fine feed arrangement that is so prized still available, a facility that is lost by mounting up the pukka Myford metric gearing conversion set.

I don't really see what is so dreadful about having an simpler and much cheaper alternative, I'm sure there is room for all in the sales area of these additional components in one form or another. The results in either case are still approximations, some are very close to being mathematically correct and quite good enough for all but the most demanding needs

Brian.

Adam Stevenson28/04/2019 13:49:39
17 forum posts

I'll let you into a secret, JS made the 33 and 34 out of the same blank so that you could swap them out without having to move the centres. They was a batch made but I don't know where they went.

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