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Graham Meek’s Tailstock Dial - MEW279

Drawing errors

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Mike Crossfield28/03/2019 08:48:20
190 forum posts
17 photos

I’ve just been reading the first part of the article in MEW 279 describing Graham Meek’s tailstock dial for the Myford S7, and noticed some obvious errors and omissions in the details of the gear cutters (figures 4 and 5). In figure 4 the r1.38 dimension for the 48 tooth cutter cannot be correct. In figure 5 the r1.5 dimension for the 54 tooth cutter is also clearly wrong. In all cases no dimension is specified for the cutter widths.

Graham Meek28/03/2019 10:28:39
102 forum posts
108 photos

To deal with the last point first, the drawing for "Typical cutter Profile" has yet to be published.

You are right in that the dimensions are wrong.

In the case of the 48 tooth gear the numbers have had an Eric Morecombe moment. "all the right notes not necessarily in the right order". The same with the numbers, they are all there, but not in the right order. The view of what I sent in is below.

myford tailstock dial 48 tooth gear.jpg

The 54 tooth gear is however way off, again below is the drawing submitted with the article.

myford tailstock dial 54 tooth gear.jpg

These radii are the flank radii of the actual tooth profile. The radii will be different if you try and use Ivan Laws tables based on the Browne and Sharp system. Where each cutter profile in the series is made to the smallest number of teeth to be cut by that cutter.

My cutters are the closest one can get to an Involute form, using a form cutter. Without resorting to a hobbing machine. This gives a much smoother action between the gears.

Regards

Gray,

Mike Crossfield28/03/2019 10:43:06
190 forum posts
17 photos

Thanks Gray

i was pretty sure that your original data would have been spot on.

Looking forward to the second article, and making my own version of the dial.

Regards

Mike

Neil Wyatt28/03/2019 14:33:14
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Moderator
16254 forum posts
679 photos
74 articles

Oh dear, sorry Graham.

Not sure what happened there as usually we don't actually edit the numbers. I suspect they had to be retyped when changing the lines to arrows.

My rough count is that there are 68 dimensions in that article so the only excuse is that it is impractical to check them all back against the original drawing; because they normally don't get retyped resetting doesn't normally introduce mistakes and we normally just look out for any obvious errors.

I'll put a correction in the next installment.

Neil

Graham Meek28/03/2019 15:40:15
102 forum posts
108 photos

Hi Neil,

No problem this end, as you know I make mistakes too.

Regards

Gray,

Steamer191528/03/2019 18:45:28
avatar
148 forum posts
31 photos

Posted by Graham Meek on 28/03/2019 10:28:39:

In the case of the 48 tooth gear the numbers have had an Eric Morecombe moment. "all the right notes not necessarily in the right order". The same with the numbers, they are all there, but not in the right order.

Where is "Mr Preview" when you need him..... smiley ...I'll get me coat.

Steve.

Jeff Dayman28/03/2019 20:18:54
1557 forum posts
37 photos

Good to see you back on here Graham. Hope all is well with you. I'll be following along with the boring head postings!

Tony Pratt 128/03/2019 21:04:00
874 forum posts
2 photos
Posted by Jeff Dayman on 28/03/2019 20:18:54:

Good to see you back on here Graham. Hope all is well with you. I'll be following along with the boring head postings!

Yes Graham, also glad to see you back!!

Best wishes,

Tony

Chris Trice28/03/2019 22:44:56
avatar
1362 forum posts
9 photos

Ditto.

Graham Meek29/03/2019 14:09:49
102 forum posts
108 photos

Thank you all for your kind regards,

Gray,

lfoggy29/03/2019 18:50:25
63 forum posts
5 photos

I am looking forward to the second installment and plan to make the dial for my metric Myford 254plus.....

Ian Welford29/03/2019 19:27:19
279 forum posts

Gray

is there a version for the Boxford AUD either in existence or planned please?

regards Ian

Graham Meek29/03/2019 21:47:11
102 forum posts
108 photos
Posted by Ian Welford on 29/03/2019 19:27:19:

Gray

is there a version for the Boxford AUD either in existence or planned please?

regards Ian

Hi Ian,

I have no plans at the moment to design a dial to fit the Boxford lathe. The last time I worked one of the machines was in the Grammar School workshop, circa 1966. If my memory serves me correctly the feedscrew thread is a single start thread. If this is so, then the dial would be a simple affair, not requiring any gearing. Unless of course the feedscrew uses a non-standard pitch, it has been known in the past.

Regards

Gray,

duncan webster30/03/2019 00:36:01
avatar
2161 forum posts
27 photos

This sounds like yet another instance of ME/MEW taking contributors drawings, redrawing them and getting them wrong. Previous editors (not the present incumbents) have denied that they redraw anything, plainly not correct. Why not just publish what is sent in, then if it's wrong they can blame the contributor. Even I can convert a dwg to a jpg, which can then be treated just like a photo.

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