I have the same problem with this same 9x20 harbor freight lathe. I have went through about 4 of the gears now. Sick of it. It’s not the bore size that’s the problem. The bracket with the bore holes is just there to keep the worm from sliding left or right. The issue I have found is the worm does not fully engage with the worm gear as much as it should. Also the handle gear on the rack and pinion barely engages causing some binding occasionally that I think breaks the teeth of the worm gear when it is engaged. I am going to take the risky move of putting my apron on my mill and taking a few thousands off the meeting surface so the apron comes up a little bit causing both the worm worm gear and the rack and pinion to engage better with their mating gears. We will see how it goes I’ll let you know. I am also going to hobb a gear out of steel because these gears are cheap and made out of cast iron. That’s why the teeth are breaking off.
My thought was that the lead screw was bending up under the tension and then the warm gear stripping the teeth off the gear. My solution was to make brass bushings for the bracket to keep the lead screw worm gear engaged with the gear. But this does create some interference problems with chips that have landed on the lead screw. engaged with the gear
Same problem. Find a Fix or the cause of the problem. Where did you get the new parts. I have a JET. New worm gear and pinion is not listed in the parts catalog. HELP!
In my experience the central machinery Harbor freight jet and grizzly 9 x 20 lathes are all the same. I have a central machinery alias Harbor freight lathe, But I get my parts from Grizzly internatonal. My part number was gear 41T in their catalog. My theory is the drive shaft is bowing upwards in disengaging from the gear. Replace the gear 3 times but now I have limited my cuts to slowest feed and only 20 thousands on a cut.(.020 on the dial)
The pinion gear was just worn out. Lathe is 26 years old and spent a lot of time in a machine shop. The gear is only cast iron. The teeth are sharp enough to shave with and worn down mostly on one side.
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I have the same problem with this same 9x20 harbor freight lathe. I have went through about 4 of the gears now. Sick of it. It’s not the bore size that’s the problem. The bracket with the bore holes is just there to keep the worm from sliding left or right. The issue I have found is the worm does not fully engage with the worm gear as much as it should. Also the handle gear on the rack and pinion barely engages causing some binding occasionally that I think breaks the teeth of the worm gear when it is engaged. I am going to take the risky move of putting my apron on my mill and taking a few thousands off the meeting surface so the apron comes up a little bit causing both the worm worm gear and the rack and pinion to engage better with their mating gears. We will see how it goes I’ll let you know. I am also going to hobb a gear out of steel because these gears are cheap and made out of cast iron. That’s why the teeth are breaking off.
My thought was that the lead screw was bending up under the tension and then the warm gear stripping the teeth off the gear. My solution was to make brass bushings for the bracket to keep the lead screw worm gear engaged with the gear. But this does create some interference problems with chips that have landed on the lead screw. engaged with the gear
Where are the bushings that are supposed to be in the bracket? Without them, getting the engagement of the gear and work isn't going to work.
No bushes in mine either .I was going to make some but I only have less than a 16th of play I have to make the holes in the bracket bigger
Same problem. Find a Fix or the cause of the problem. Where did you get the new parts. I have a JET. New worm gear and pinion is not listed in the parts catalog. HELP!
In my experience the central machinery Harbor freight jet and grizzly 9 x 20 lathes are all the same. I have a central machinery alias Harbor freight lathe, But I get my parts from Grizzly internatonal. My part number was gear 41T in their catalog. My theory is the drive shaft is bowing upwards in disengaging from the gear. Replace the gear 3 times but now I have limited my cuts to slowest feed and only 20 thousands on a cut.(.020 on the dial)
Did you find out the issue?, only thing I can think of is saddle or rack drag?
The pinion gear was just worn out. Lathe is 26 years old and spent a lot of time in a machine shop. The gear is only cast iron. The teeth are sharp enough to shave with and worn down mostly on one side.
Hi there, maybe rename your video to 9 x 20 lathe feed problem, then people may find it easier.
Did you ever find a solution?
Maybe you're engaging two moving parts at the same time when they're supposed to stop first.just a taught.