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Jeff Thyer's Myford Gear Hobber

Video of device featured in MEW 258

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Jeff Thyer's Myford Gear Hobbing Attachment

Featured in MEW 258 and following issues, this ingenious attachment allows both ordinary spur gears and helical gears to be made on a Myford lathe.

Neil Wyatt27/07/2017 09:45:49
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In MEW 258 we will start a short series on a gear hobbing device by Jeff Thyer that fits to a Myford ML7, but in principle it should be adaptable to any similarly sized screwcutting lathe, including mini lathes.

See the video here:

jeff-thyer's-myford-gear-hobbing-attachment

Neil

John Stevenson27/07/2017 10:54:21
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10 out of 10 for getting a class article such as this for the magazine.
Jeff has obviously given a lot of thought to the whole process and got it right
Hopper27/07/2017 11:02:55
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That's interesting. Look forward to seeing the articles. I have a spare ML7 kicking around the shed that I have been wondering what I will do with it when I get it finished up. Hard to justify keeping it as a lathe when I have the Mighty Drummond already. But a dedicated gear hobbbing machine, well I could always use one of them. Hmmm....

Neil Wyatt27/07/2017 11:34:52
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Posted by Hopper on 27/07/2017 11:02:55:

That's interesting. Look forward to seeing the articles. I have a spare ML7 kicking around the shed that I have been wondering what I will do with it when I get it finished up. Hard to justify keeping it as a lathe when I have the Mighty Drummond already. But a dedicated gear hobbbing machine, well I could always use one of them. Hmmm....

It isn't a permanent conversion, you can still use it as a lathe!

I reckon the principle would work on a mini-lathe if you change the gear ratio by 2:1 for the 16 tpi leadscrew.

Neil

John Stevenson27/07/2017 11:42:00
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Gear cutting is a pet subject of mine and I have studied the subject in a other of depth.
Many have also trod the path but make classic mistakes like feeding the hob in directly and not taking account of the hob helix angle
Neil Wyatt27/07/2017 11:56:01
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He's also managed to keep his article fairly short, but there are several pages of drawings that will appear over a few issues.

Simon Collier27/07/2017 12:57:20
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What month please Neil? October? They will be late here and I'll have trouble tracking MEW down as the local newsagents don't have it anymore.

joey27/07/2017 14:57:14
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Looking forward to a seemingly interesting subject.

Ian P27/07/2017 15:01:59
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Posted by Simon Collier 1 on 27/07/2017 12:57:20:

What month please Neil? October? They will be late here and I'll have trouble tracking MEW down as the local newsagents don't have it anymore.

With respect, you could work out which month it appears from the issue number which Neil did quote.

One thing Neil cannot work out though is where 'your' local newsagents arewink

A good case for a subscription I think

Ian P

Ian P27/07/2017 15:03:13
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Oops, I forgot to say that the article looks to be really interesting.

Ian P

John Stevenson27/07/2017 15:08:07
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Far more interesting than the discussion on new diesels in 2040 of which no one here has any control over even it it reaches fruition in 23 years entirely unchanged

Edited By John Stevenson on 27/07/2017 15:08:40

Mark Rand27/07/2017 19:13:48
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Hmm, an ML7B, will enable gears varying between 8 teeth (only with modified addendum) up to 504 teeth smiley.

 

Need to make the powered cross feed as well...

Edited By Mark Rand on 27/07/2017 19:14:03

Neil Wyatt27/07/2017 19:45:26
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MEW 258 is the September issue, out in early August in the UK. Planned to conclude in issue 259 the 'Autumn Special' (we have 13 a year so one doesn't get a month, so we call it special to stop it feeling left out).

Neil

Andrew Johnston27/07/2017 21:58:59
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Wow, that's pretty nifty. I look forward to reading the article(s). thumbs up

Andrew

Hopper27/07/2017 23:41:23
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Posted by Neil Wyatt on 27/07/2017 11:34:52:
Posted by Hopper on 27/07/2017 11:02:55:

That's interesting. Look forward to seeing the articles. I have a spare ML7 kicking around the shed that I have been wondering what I will do with it when I get it finished up. Hard to justify keeping it as a lathe when I have the Mighty Drummond already. But a dedicated gear hobbbing machine, well I could always use one of them. Hmmm....

It isn't a permanent conversion, you can still use it as a lathe!

Neil, I was looking for an excuse to keep a second 3.5" lathe littering my shed. You're not helping.

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