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

This topic has 32 replies, 21 voices, and was last updated 1 May 2019 at 18:28 by Pete Rimmer.

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17 April 2019 at 21:50 #26562
Karl Challis
Participant
@karlchallis22968
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17 April 2019 at 21:50 #405515
Karl Challis
Participant
@karlchallis22968
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
17 April 2019 at 23:12 #405522
Zan
Participant
@zan
Got mine at the Fosse from Myford/RDG. They had loads
17 April 2019 at 23:45 #405529
clivel
Participant
@clivel
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
18 April 2019 at 00:55 #405531
Hopper
Participant
@hopper
Put a WANTED ad on this site. I got several Myford gears to complete my set that way.
18 April 2019 at 07:48 #405543
Ex contributor
Participant
@mgnbuk
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
18 April 2019 at 22:23 #405642
Simon Williams 3
Participant
@simonwilliams3
Karl (OP), Nigel(mgnbuk)

Gents I have sent you a PM.

HTH Simon
19 April 2019 at 07:34 #405650
Malcolm Jones 1
Participant
@malcolmjones1
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
19 April 2019 at 07:39 #405651
JasonB
Moderator
@jasonb
No of teeth plus 2 all divided by DP

(34 + 2) / 20 = 1.8"

Use a 14.5pa cutter
19 April 2019 at 11:08 #405669
john fletcher 1
Participant
@johnfletcher1
Have you tried HPC at Chesterfield 01246 268080 or Daval at Hatfield.0707 268536
19 April 2019 at 13:02 #405690
JasonB
Moderator
@jasonb
Like most other off the shelf gears HPC and Daval do 20pa not 14.5pa.
19 April 2019 at 18:00 #405724
Brian Wood
Participant
@brianwood45127
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
19 April 2019 at 20:30 #405734
Nick Hulme
Participant
@nickhulme30114
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…….. 😀
19 April 2019 at 20:35 #405735
JasonB
Moderator
@jasonb
Depends who's shelf the cutters came off, quite a few 14.5 pa cutters about particularly old second hand ones.
19 April 2019 at 21:17 #405741
Karl Challis
Participant
@karlchallis22968
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?
19 April 2019 at 21:40 #405746
lfoggy
Participant
@lfoggy
Try finding a 48 tooth gear. They are even more difficult to get hold of !
27 April 2019 at 20:39 #406764
Pete Rimmer
Participant
@peterimmer30576
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?
27 April 2019 at 21:37 #406787
john lavin
Participant
@johnlavin61025
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 .
28 April 2019 at 00:30 #406819
Roderick Jenkins
Participant
@roderickjenkins93242
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
28 April 2019 at 11:08 #406857
Brian Wood
Participant
@brianwood45127
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.
28 April 2019 at 13:49 #406893
Adam Stevenson
Participant
@adamstevenson91624
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.
28 April 2019 at 14:07 #406895
Roderick Jenkins
Participant
@roderickjenkins93242
Hi Brian,

I've extolled the virtue of the 33 and 34 tooth gears on this forum many times. My use of the word "cheat" (note the inverted commas) was to emphasise Myford's possible reluctance to provide them – neither are currently available.

Cheers,

Rod
28 April 2019 at 16:31 #406912
Russell Eberhardt
Participant
@russelleberhardt48058
If you have a 3D printer you could download the file for a Myford 34 tooth gear from Thingverse here. I printed a gear for my Atlas about a year ago just to see if it would work. I've been using it ever since in the fine feed set-up as it reduces the noise.

Russell
28 April 2019 at 16:35 #406913
Pete Rimmer
Participant
@peterimmer30576
I'm going to hob a few pairs of these gears since they are not currently available and I want to raise some funds to get a DRO for one of my machines.
28 April 2019 at 20:57 #406961
Andy G
Participant
@andyg
RDG sell Myford spares
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