Where do I find ..........

okay, 8 teeth, but what pitch?
(I don't want to have to look it up by lathe model.....or work it out from tooth count and diameter....)

If I have it in my shop, I'll lend it to you by mail.
If I don't I can check the bin at my local tool monger for a decent used one at a good price.

PM me if interested, I do not check this site every day.
-brino
 
middle.road said:
Are the teeth OK?
Perhaps braze a plug and re-bore it?
(picture would assist.)
Click to expand...
Teeth are worn. That is the problem. The teeth that intersect with the rack produces almost .008 slop (not backlash) when transiting carriage.

Pinion.JPG
 
Mark Needham said:
It's a small gear. Presuming therefore that it is a high speed.????
Q. What sort of speed max, would it do?
Q. What material is the gear and its mating gear made of?
Q. How much use does it get.?
Q. Seems a bit crass to ask this, but how much longer do you reckon you will be using the machine?

At a pinch, depending on circumstances, ie, answers to the above questions, you have an option not many would dare even think about.
lets say answers are, 200rpm, castiron, 20 times a year@1hour per week, 20 years. ( which is a reasonable duty) The Gear will spin <10 million revs.
The i/p gear on an average cars gear box, at ~2000rpm, etc is ............bloody big numbers and a far greater HP Duty cycle, and so on. Here's the thing.

Cut the gear by hand. The function of success, is proportional to your own skill and accuracy, but my wife would be able to achieve a do-able gear. I reckon. I have made several over the years, 30, and no complaints yet.

edit:- PS. At a pinch, send the gear to me, I'll do you one, for the pleasure of showing you what can be done.
Click to expand...

I would be more than happy to pay for one! I culdn't do it, my hands shake too much. One of the good things about machinery! They don't! (usually)
How would I get it to you? Don't know how PM works.
paulandreasen@gmail.com
 
Mark Needham said:
It's a small gear. Presuming therefore that it is a high speed.????
Q. What sort of speed max, would it do?
Q. What material is the gear and its mating gear made of?
Q. How much use does it get.?
Q. Seems a bit crass to ask this, but how much longer do you reckon you will be using the machine?

At a pinch, depending on circumstances, ie, answers to the above questions, you have an option not many would dare even think about.
lets say answers are, 200rpm, castiron, 20 times a year@1hour per week, 20 years. ( which is a reasonable duty) The Gear will spin <10 million revs.
The i/p gear on an average cars gear box, at ~2000rpm, etc is ............bloody big numbers and a far greater HP Duty cycle, and so on. Here's the thing.

Cut the gear by hand. The function of success, is proportional to your own skill and accuracy, but my wife would be able to achieve a do-able gear. I reckon. I have made several over the years, 30, and no complaints yet.

edit:- PS. At a pinch, send the gear to me, I'll do you one, for the pleasure of showing you what can be done.
Click to expand...

Forgot

Pinion.JPG
 
brino said:
okay, 8 teeth, but what pitch?
(I don't want to have to look it up by lathe model.....or work it out from tooth count and diameter....)

If I have it in my shop, I'll lend it to you by mail.
If I don't I can check the bin at my local tool monger for a decent used one at a good price.

PM me if interested, I do not check this site every day.
-brino
Click to expand...

Haven't a clue to pitch.

Pinion.JPG
 
to be completely honest, it shouldn't matter how worn that gear is as long as it meshes well with its mating gear or rack. I have the same lathe and I have at least 1/6 turn slop in the carriage, doesn't make the slightest difference to my work and most of the time I barely notice it. There's no longitudinal measurement on the 618 any sort other than what you put on there (I have an iGaging DRO which is nice), so backlash is moot.

Unless it interferes with your ability to move the tool into a cut, I wouldn't worry about it.
 
Last edited:
pandreasen said:
I would be more than happy to pay for one! I culdn't do it, my hands shake too much. One of the good things about machinery! They don't! (usually)
How would I get it to you? Don't know how PM works.
paulandreasen@gmail.com
Click to expand...
G’day Paul, Just got back home. Yeah, I know about this getting old bit. 70 now, and starting to slow down some. Ah well, them’s the breaks, Hey! Check your postage, before you commit. I just sent a small roo skin to a mate in Tooele Utah, cost me A$70.00. Bastards are into us for everything. I’ll knock it up out of some 4140, harden and temper. OK, Post it to me @, ? Give us a couple of days, and I’ll get it back to you. Cheers mate, Mark Needham
 
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