I have a gear from a lathe that needs to be repaired.
There is a crack along the keyway.
The manufacturer wants $975 dollars for this gear. Ouch!
Any tips on how to grind and what to use to weld it.
Thanks
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- ldbtx
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Any chance of picking up a used gear on one of the lathe or machining forums?
LDB
LDB
Miller Bobcat 225
Tweco Fabricator 211i
AHP AlphaTIG 200x
Lincoln SP-135+
Hypertherm Powermax 30 Air
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Tweco Fabricator 211i
AHP AlphaTIG 200x
Lincoln SP-135+
Hypertherm Powermax 30 Air
ProStar O/A torch
- Otto Nobedder
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I'd do a little NDE to see the full extent. A good long soak in lacquer thinner or MEK, blow dry and hot dry, then dye penetrant. If the crack extends less than about a third of the length of the gear teeth, I'd consider a stop-drill, then bevel with a dremel, then weld with a Ni-55 type rod with TIG (full penetration, and leave the stop-drill hole, then square up the keyway).
If the crack extends more than half the depth of the gear, I'd consider an acid-soak for pre-fluxing, then flux and silver-braze it (and, yes, stop-drill it), clean it up, and hope for the best.
I agree with taking a long search on machinist forums for a used part from someone scrapping a similar lathe as the long-term solution.
Another alternative is to find an eager machine shop in your neighborhood, perhaps a technical college, and have them duplicate the part. I recently had bushings made at a regular machine shop for an old Buffalo flywheel punch. The guy with the parts wanted us to spend upwards of two grand to ship him the flywheel, do a bunch of work we didn't request, and install the bushings. I sent a drawing down the road, and about $250 later, I had new bushings.
Steve S
If the crack extends more than half the depth of the gear, I'd consider an acid-soak for pre-fluxing, then flux and silver-braze it (and, yes, stop-drill it), clean it up, and hope for the best.
I agree with taking a long search on machinist forums for a used part from someone scrapping a similar lathe as the long-term solution.
Another alternative is to find an eager machine shop in your neighborhood, perhaps a technical college, and have them duplicate the part. I recently had bushings made at a regular machine shop for an old Buffalo flywheel punch. The guy with the parts wanted us to spend upwards of two grand to ship him the flywheel, do a bunch of work we didn't request, and install the bushings. I sent a drawing down the road, and about $250 later, I had new bushings.
Steve S
- TRACKRANGER
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If it's a lathe gear, I certainly doubt it. It's probably run from the spindle shaft and connected in mesh with other gears to the screw cutting gearbox and lead screw / feed screw. From the looks of it, it's had some pretty rough mesh engagement actions, being used like a dog clutch.pigpen60 wrote:the gear isn't timed is it?
Last edited by TRACKRANGER on Fri Jun 12, 2015 8:10 am, edited 1 time in total.
EWM Phonenix 355 Pulse MIG set mainly for Aluminum, CIGWeld 300Amp AC/DC TIG, TRANSMIG S3C 300 Amp MIG, etc, etc
- Braehill
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I'm not saying that this gear is made this way but a lot of gears now are being made from sintered pressed metal and other pressed metals. I'm not sure if the can be welded with any positive results or not. I know that the gears that I ordered for my little Sears (Enco/Emco?) lathe were indeed pressed metal. Just something to consider.
Len
Len
Now go melt something.
Instagram @lenny_gforce
Len
Instagram @lenny_gforce
Len
Just my $.02
If it can be welded I'd weld it up including the old key area, bore/hone it back to proper size and broach the new key 90 degrees out, this way that stress isnt right on the repaired area.
If it can be welded I'd weld it up including the old key area, bore/hone it back to proper size and broach the new key 90 degrees out, this way that stress isnt right on the repaired area.
I weld stainless, stainless and more stainless...Food Industry, sanitary process piping, vessels, whatever is needed, I like to make stuff.
ASME IX, AWS 17.1, D1.1
Instagram #RNHFAB
ASME IX, AWS 17.1, D1.1
Instagram #RNHFAB
- Otto Nobedder
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- Otto Nobedder
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Okay, Len, I get the joke now.Mike wrote:Len welcome to the forum.
Andover Mike was a subject of discussion some time ago, for posting nothing more valuable than "Hi!"
I think this sums up his approach to the forum.
Steve S
- TRACKRANGER
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Getting back on track, I wonder how the poor O/P is getting on with the repair....
EWM Phonenix 355 Pulse MIG set mainly for Aluminum, CIGWeld 300Amp AC/DC TIG, TRANSMIG S3C 300 Amp MIG, etc, etc
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