By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Oct 22nd

Myford Change Gear trouble

All Topics | Latest Posts

Search for:  in Thread Title in  
Mark Gould 116/07/2019 16:39:13
130 forum posts
92 photos

Gents,

We are trying to cut an M10 thread on our S7 lathe. We have a metric conversion set and have installed the slotted quadrant as per Myford booklet. The quadrant has been fitted with the required change wheels.

The problem we are having is with the Tumbler Stud. As per the booklet, it must have 30 teeth. The tumble stack is quite thick as the tumbler gear itself has a flange of sorts. This makes the outer wheel on the tumbler stack stick out too far as it comes into contact with the outer wheel beneath it. It is only supposed to drive the inner of the 2 wheels beneath it. I took some photos to illustrate the problem. It may look ok in the photo but the outer wheel on the tumbler stud is actually touching the outer wheel of the stack below it as it's only supposed to drive the inner wheel of the stack beneath it.

Any help is greatly appreciated,

Mark

1956c490-6468-4ae1-9370-c1ab3571cc26.jpeg

 

Edited By Mark Gould 1 on 16/07/2019 16:40:35

ega16/07/2019 16:45:26
1267 forum posts
108 photos

Is it just a matter of packing out the new quadrant?

Edited By ega on 16/07/2019 16:47:46

KWIL16/07/2019 17:07:18
3121 forum posts
56 photos

Yes

Martin Kyte16/07/2019 17:09:06
1493 forum posts
24 photos

It looks like you need to fit a spacer between the two change wheels on the quadrent. Myford supply such an item which is used on most wheel set up's on non gearbox series 7 lathes to provide clearence and stop the change wheels rubbing. It looks like a penny washer with a cut out for the key so you can slide it onto the stud. If you have a set of change wheels you should have one.

regards Martin

Nick Hulme16/07/2019 17:16:14
703 forum posts
37 photos

Yes, add spacers, or skim the quadrant to align correctly.

Mark Gould 116/07/2019 17:24:18
130 forum posts
92 photos

Yes, that is the logical step. I took a short cut and put a washer on the whole stack which moved the whole stack outwards but a spaced between the 2 wheels is the way to go. I'll order the parts from Myford.

Thanks gents!

I told my Dad we'd have the answer inside 15 minutes, you gents are fantastic, many thanks from Dad and myself

ega16/07/2019 17:53:31
1267 forum posts
108 photos

Glad to help and to know who the "we" are!

Although I have a shop-made equivalent of the Myford conversion set, I mostly just "play tunes" on the stud gear in the way that has been frequently mentioned here. Brian Wood's book is recommended on this topic.

KWIL16/07/2019 23:03:40
3121 forum posts
56 photos

Before you leap to any further conclusions.

Consider if the Anchor Pin, part no A3015 Dwg Ref 203 is correctly assembled into the base of the gearbox. Its depth is set by a single Socket Setscrew (from below). If correctly set this is what hold the quadrant in the correct position to ensure the gears do in fact properly align, without adding any spacers to the gear train.

Mark Gould 117/07/2019 23:28:54
130 forum posts
92 photos

Good point, KWIL, many thanks I will certainly do that next time I am at the lathe. I didn’t even know there was a pin down there.

Mark Gould 117/07/2019 23:32:43
130 forum posts
92 photos

Ah I now know which pin you mean. I wasn’t aware that pin was only held in by a set screw. I just had a look at a pdf I have here on my tablet and see it how that could cause this issue.

thanks again, excellent.

Mark Gould 117/07/2019 23:32:44
130 forum posts
92 photos

Ah I now know which pin you mean. I wasn’t aware that pin was only held in by a set screw. I just had a look at a pdf I have here on my tablet and see it how that could cause this issue.

thanks again, excellent.

Edited By Mark Gould 1 on 17/07/2019 23:35:21

Mark Gould 123/07/2019 12:10:25
130 forum posts
92 photos

KWIL,

Just getting back to what you said, it's actually in the manual that I have. Makes it all the more embarrassing that I missed it, duh!

Mark

img_1106.jpg

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
Meridenne Boat 2019
Eccentric July 5 2018
Ausee.com.au
TRANSWAVE Converters
ChesterUK
Eccentric Engineering
Warco
cowbells
emcomachinetools
Allendale Electronics
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest