Gear hobbing in the lathe

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Gear hobbing in the lathe

This topic has 10 replies, 6 voices, and was last updated 29 July 2016 at 13:26 by Paul Relf-Davies.

Viewing 11 posts - 1 through 11 (of 11 total)

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28 July 2016 at 12:36 #248344
Baldric
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@baldric
I have seen this on another website **LINK** and thought it needed a wider audience. I was thinking I may build a hobbing machine, possibly the one being serialised in MEW, but this may be an easier option. Only thing is need to remove the rack to disable the traverse, I am sure there would be other options such as adding a separate take off from the lead-screw, I guess the feed is also manual.

What do others think?

Baldric.
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28 July 2016 at 12:36 #15862
Baldric
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@baldric
28 July 2016 at 15:11 #248364
John Stevenson 1
Participant
@johnstevenson1
Very interesting except for one thing in the comments. Couple of people mentioned the Jose Rodregious DVD on gear cutting.

Do not waste your time and money on this one for many reasons. One he uses the wrong value for Pi, 3.416 ?? So all his calculations are wrong. The filming is all out of focus so a close up shows nothing and he’s using a machine made out of wood and licorace so the end result is about as good as a worn out jubliee clip.

Don’t waste your money, if you want videos, go on You Tube and search for a user called Hobbynut.
Far better videos and for free
29 July 2016 at 00:00 #248422
I.M. OUTAHERE
Participant
@i-m-outahere
Posted by John Stevenson on 28/07/2016 15:11:29:
Very interesting except for one thing in the comments. Couple of people mentioned the Jose Rodregious DVD on gear cutting.

Do not waste your time and money on this for many reasons . One he uses the wrong vaue for Pi, 3.416 ?? So all his caculations are wrong.

I agree , he even gives you a photo copy of his formula that is also incorrect !

How do i know this ?

The funny thing is when he free hobs the gear he has to set up the dodgy dividing head and gash the gear blank anyhow , i would have just used a normal gear cutter and not worried with making the hob .

You can buy asian made cutters that work just fine cheaply enough .

Must check out the Hobby nut channel , sounds interesting !
29 July 2016 at 08:36 #248453
I.M. OUTAHERE
Participant
@i-m-outahere
Damned if i can find the hobbynut channel or user ?
29 July 2016 at 09:34 #248460
Bazyle
Participant
@bazyle
If you do a search you get another thread on this forum with a link from JS – and that never worked either
29 July 2016 at 09:59 #248470
John Stevenson 1
Participant
@johnstevenson1
Yes sorry lads, quick look and I can't find it. I'll look later tonight but if like me, he lost his primary Google account it wipes all your Youtube video's out unless you re-upload them.
29 July 2016 at 10:18 #248476
Ajohnw
Participant
@ajohnw51620
If some one wants to hob gears at least the lathe mod looks interesting.

I've more or less concluded that conventional cutters are a simpler option. A few cutters as needed doesn't have to break the bank. In fact sets in some small sizes need not be that expensive.

If for instance I want to cut mod or dp worms on my lathe I will have to cut some gears. 2 of them. I just need 1 cutter for these and for the use the cutter will get RDG stuff will be fine. In fact a silver steel one would do.

There are several options on things like clocks but I suppose these could be hobbed as well.

John

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29 July 2016 at 10:29 #248481
John Stevenson 1
Participant
@johnstevenson1
But try buying a cutter for a special gear, that's where hobbing comes into account.

Three gears, all with different number of teeth but all cut on the same blank.

Only one of those could be cut with a gear cutter.
29 July 2016 at 12:40 #248512
Bazyle
Participant
@bazyle
Posted by John Stevenson on 29/07/2016 09:59:43:

he lost his primary Google account it wipes all your Youtube video's out unless you re-upload them.

That's bad news – all sorts of good stuff could disappear if someone dies or has a computer wobbly. Bit like losing stuff off a forum or when picture hosting sites time out.
29 July 2016 at 13:26 #248517
Paul Relf-Davies
Participant
@paulrelf-davies37806
~~https://www.youtube.com/user/Hobbynut~~

~~I doesn't help that the link contains 'Hobbynut', but the name on screen is: OldManShorty~~

Scratch that.. No ME-elated videos….sorry ….

P.

Edited By Paul Davies on 29/07/2016 13:31:51
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