clock winding ratchet how to build one

how do I build one, the one i need has 14 div. with id of 1.000. i know this is not like a gear like this **LINK**

So how is it done and what cutter I have never made one of these

Hi Brett I can't answer your question but I often watch 'clickspring' videos 'link' for inspiration

H

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So, is it something more like this, Brett : **LINK** ?

https://mechamechanisms.com/ratchet-mechanism-31

If so ... the teeth are often cut by planing; although [assuming your referenced id is one inch] you may be able to make a suitably sized 'cutting frame' based on this design : **LINK**

http://www.billooms.com/Resources/OTCutting/HCFConstruction.pdf

MichaelG.

Edited By Michael Gilligan on 17/05/2018 07:04:49

I don't know what machinery you have but ratchet teeth can be cut using a standard dovetail cutter if you have a mill and dividing head. If you haven't, and for only 14 teeth, you could probably make one by hand with some careful marking out and filing.

Depending on how many clocks you visualize making, you can purchase a ratchet cutter. ( Meadows and Passmore springs to mind ) If only one, follow John Haine's advice

Roy

John & Roy

I take it that the consensus is that my reading of Brett's statement is wrong.

MichaelG.

Now you mention it it is one interpretation. I think the OP needs to clarify what he means! Does his link mean "not a ratchet like this" or "not a gear but like this". I assumed that the ID was the hole in the middle in mm, but it could be the base circle in inch.

The only way I can think of to make the internal teeth is to make them on the inside of a ring, by planing or filing, then solder to a disc.

Assuming it's a normal winding ratchet like the one you linked to you can cut the ratchet teeth using a home made single point cutter but you will need some means of indexing the 14 positions. A bit like this:

Russell

You can use a single point cutter on brass and probably get away with it on steel if you use a slow speed and small diameter. You probably have a flycutter for your mill that will hold the tool bit so you can use that. Just draw out the cutter and ratchet on paper at a larger scale to plan the shape of the cutter and the position of the wheel blank.

What kind of indexing mechanism do you have? Unless you are trying to repair an antique to original standard you don't have to stick with exactly 14 teeth, 15 would do. You can use a change-wheel off your lathe to provide the divisions.

Bazyle i have a A dividing head and I need to do this in steel.

Hi Brett,

This ('scape) wheel was cut from silver steel using a single point fly cutter similar to Russell's setup.

The cutter was (also) silver steel, hardened and tempered. With a dividing head in a mill/drill, I cut the teeth in two distinct passes to get the angles right. In other words, the cutter was not full-form. You can get an idea of this from the roughness at the bottom of the teeth.

Initially, this profile was cut a short distance along the bar of silver steel before parting off. Subsequently, the wheel was itself hardened and tempered

The diameter of the wheel overall is 3/4" (19mm) and the eventual thickness 1/16" (1.5mm)

Hope this adds more confidence re cutting the teeth in steel.

Regards,

Sam

You would be able to cut a steel ratchet using a dovetail cutter, would need to mount the blank very firmly though. Later I'll post a photo of one I did in brass, principle is the same.

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Brett,

Could you please put me out of my misery ?

I still don't know whether my interpretation of your opening post was right or wrong.

If I was right [and you want to make an internally-toothed ratchet wheel] then it's an interesting problem.

If I was wrong [which appears to be the consensus] then, as John Haine indicated, it's pretty straightforward work.

MichaelG.

I missed it too, Michael.

Brett says it ... has 14 div. with id of 1.000.

id = Inside diameter !

Sam

Edited By Sam Stones on 18/05/2018 19:55:09

Above photo is 60 tooth wheel cut with dovetail cutter. One side of each tool is radial. This is for a Woodward Gearless Clock.

I do need to make a racket wkeel and goes on 1898 edison gem phonograph that is why it is 1.oo od. The ones I see on ebay and other places are worn out, thay is why I need to make it. I do have a indexing head that I use may be once ever 6 years. But the info you guys have give me has help.

.

[ ... as opposed to 1.000 id ]

I which case, I was wrong.

MichaelG.

.

Sorry ... Just spotted my typo.

"I which case ..." should read "In which case ..."

MichaelG.