Trying to learn about Clock Gears

[not done it yetParticipant @notdoneityet]

What I am still confused over is what is meant by 'rack' in relation to tooth / gear machining.

A rack is a gear of infinite diameter.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Chris TickTock on 23/12/2019 10:58:34:

[…]

What I am still confused over is what is meant by 'rack' in relation to tooth / gear machining. If it is a line if profiles I don't get it …can any clarify what a rack is in the context of making a wheel or pinion?

Chris

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Chris,

Yes a rack is, as you surmise, a line of profiles … as in a rack & pinion mechanism.

This is the primary form, from which specific wheels and pinions can be generated by shaping.

Risking the contempt of Hopper : I’m afraid you will need to do quite a lot of background reading, if [as it appears] you want to understand the subject.

MichaelG.

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Edit: Start here to get an idea of the basics: https://youtu.be/J1UOjBLo-2

 

Edited By Michael Gilligan on 23/12/2019 11:36:39

[Chris TickTockParticipant @christicktock]

Thanks Michael. The issue is I have collected numerous facts and opinions on this subject and realised I needed time to get an understanding. I hope this is now coming together. over the next few months my project will be to machine a brass wheel so a certain amount of knowledge is required.

i suspect as I try to start actually doing it the issues and lack of understanding will initially jump out but that's the fun of achieving new horizons.

Chris

[Chris TickTockParticipant @christicktock]

As an aside I note there is no obvious 'Edit' facility on this forum which seems a pity…am I missing a trick here?

chris

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Chris TickTock on 23/12/2019 11:22:59:

As an aside I note there is no obvious 'Edit' facility on this forum which seems a pity…am I missing a trick here?

chris

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The edit option is only available for a short time, unfortunately

[ look for the ‘edit post’ button in the green bar at the top of your post ]

… You will see that I just had time to edit my post.

MichaelG.

Edited By Michael Gilligan on 23/12/2019 11:34:47

[Anonymous]

Posted by SillyOldDuffer on 23/12/2019 10:01:52:

Plenty of value in employing craft methods as a hobby, but primitive skills and copying others is only the beginning….

Eloquently put. If I ever finish my traction engines I fancy making a clock, and darn right I'd be using CAD, CAM and CNC as well as hand methods.

Andrew

[Neil WyattModerator @neilwyatt]

Edit is available for long enough to allow correction of 'oops' errors but not long enough for the retrospective edits to win arguments seen on some less well mannered forums than this one…

Neil

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