[douglasco]

We have a Lagun that one of the gears stripped. Its about 2inch in diameter and has 33 teeth. Its like a spur gear but the teeth have beveled ends for lead in on both ends and the ID is splined. Lagun said they don't have the part.

[R Pikula]

Check Boston Gear..should be able to get OD to size. Then wire cut spline. Or,
wire cut ID and OD.
toppik

[handlewanker]

Hi, the gear teeth will be just a straight forward gear cutting exercise using a dividing head etc, but the splined bore needs a slotting attachment on the mill arm, using a Bridgeport type mill with the slotting head on the back, or any mill with a slotting attachment.

The material for the gear would be Nickel Chrome steel and case hardened after cutting.

Case hardening is necessary otherwise in just a short while the gear will wear out and it takes quite a bit of work to make it along with the splined bore.

This gear sounds like the same gear I have on my Ajax mill, which is attached to a long shaft that raises and lowers the knee.

Getting this gear made as a jobbing shop job would cost you an arm and a leg, try about 15 hours work and $80 to $100 per hour labour rates.

You might try the last resort method.....turn the teeth off the gear with carbide, (or grind it), and make a new gear blank and shrink it onto the existing gear blank.

The hardest part would be to cut the spline in the gear bore if you were to make a complete new gear, and for that you need a slotting attachment.

Cutting the teeth off the gear and welding it up and recutting the gear would lose it's hardness value.

If you rely on this machine for production use, don't mess about with DIY, get it made outside and get a certificate of warranty.

If Money is the problem I would recomend the cutting off of the gear teeth and shrinking on a new steel ring and recutting the gear teeth, provided you have enough material to allow turning off the teeth and fitting a new ring.

I would also recommnd pegging the ring to the gear blank to prevent it turning under load.
Ian.