AL960b change gear tooth profile?

[variant22]

I need to cut an m12 1.75 thread. Unfortunately the AL960b does not come with the necessary change gear. I am thinking of getting a cutter so I can make the gear. I have no idea what tooth profile these gears run. Any ideas?

[pipeclay]

Get one of your gears and add 2 to the tooth count divide this by the od of the gear,if its dp it should be a whole number or very close,if its not it would probably be a module,at a guess I would say m1.25.

[simonl]

Hi,

Have a look at the lathe owners manual. The manual for my lathe listed all the gears, No. teeth and the module. Yours maybe the same to similar.

Simon

[variant22]

Get one of your gears and add 2 to the tooth count divide this by the od of the gear,if its dp it should be a whole number or very close,if its not it would probably be a module,at a guess I would say m1.25.

Thanks pipeclay for the help. The numbers I came up with are as follows:

(30+2) / 40 = 0.8
(32+2) / 42.5 = 0.8

Looks like it is module. Now I have to figure out how to measure the profile to confirm M1.25.

Hi,

Have a look at the lathe owners manual. The manual for my lathe listed all the gears, No. teeth and the module. Yours maybe the same to similar.

Simon

I checked the Grizzly manual which is much more detailed and did not spot anything on the gear profile. I will hunt down the Chinese manual..

[Ueee]

Thanks pipeclay for the help. The numbers I came up with are as follows:

(30+2) / 40 = 0.8
(32+2) / 42.5 = 0.8

Looks like it is module. Now I have to figure out how to measure the profile to confirm M1.25.

PC's guess was that it would be 1.25, just a guess. You have worked out above that it is M.8. Finer than i would have thought. What gear(s) do you need to make?

Ew

[jhovel]

Variant22, where are you?
I have a full set of Module 1 cutters if you can use them (for a loan). PM me if that turns out to be the right size.

[pipeclay]

Get the Jesus nails, wood and hammer out.

It should of been OD divided by tooth count plus 2.

[Ueee]

Get the Jesus nails, wood and hammer out.

It should of been OD divided by tooth count plus 2.

Translation: I told you to work it out backwards, it should be 40/30+2, so you do get M1.25
Why PC can't just say that is beyond me. I think he thinks he's funny

Ew

[pipeclay]

Apart for waiting for the crucifiction what part of OD divided by tooth count plus 2 wasnt said.

[PDW]

Translation: I told you to work it out backwards, it should be 40/30+2, so you do get M1.25

Not if you pay any attention to the precedence of mathematical operators, you don't.

However 1.25 is the correct answer....

PDW

[Stustoys]

To go just a little OT. Anyone got a chart that says anything about pitch tolerance? I dont ever recall seeing anything about it, there must be something out there.

How long a thread do you need and how good does it need to be?
How about 11tpi with 30 driver 40 driven? I make it 1.732mm............ close enough? I assume not, but I've got nothing to back that up. Over 6 turns thats an error of 0.11mm, I guess it really comes down to what its going to be used for.

Stuart

[Michael G]

Anyone got a chart that says anything about pitch tolerance? I dont ever recall seeing anything about it, there must be something out there.

I think you'd need to start looking at national standards and thread tolerances as it would be covered in there. For our purposes I think it comes down to whether the nut fits or jams.

Michael

[Oldneweng]

I think you'd need to start looking at national standards and thread tolerances as it would be covered in there. For our purposes I think it comes down to whether the nut fits or jams.

Michael

I think it is related more to whether the thread breaks or the nut rounds off myself.

Dean

[variant22]

Thanks all for the vigor. M1.25 it is. I will head off and hunt down a cutter.

Variant22, where are you?
I have a full set of Module 1 cutters if you can use them (for a loan). PM me if that turns out to be the right size.

Thanks for the offer Joe (it turns out it is M1.25). I appreciate the offer.

[jhovel]

Maybe we should have a register who's got what cutter sets for gears - I mean us hobbyists of course.
That way we can quickly know who to contact to get a gear made or a loan of the right cutter.