Jet 1340 PDB parts needed

[Edward2541]

Hi my name is Ed, I am totally new to home machining and this forum. I bought a 1987 Jet 1340 PDB lathe, it looks to be in pretty good shape, but it's missing one gear, a small shaft, and one broken brass gear that drives the carriage gears off of the lead screw. I have almost no info about this lathe, besides the almost destroyed manual. I believe the part numbers are 10-0429B-00 for the M2x22 tooth gear, (I believe this is the broken brass gear I do have). 10-0430-00 is the M1.5x40 tooth, it drives the other gears in the carriage. Last is the shaft that connects the two gears 10-0426-00. Any info about this lathe, including technical drawings of these parts would be greatly appreciated, thanks!

[nc5a]

Try getting in touch with Jet Machine tools. They were able to supply me with a couple manuals in the past. Make sure you have the serial number and often times they like a photo or two of the machine. Good Luck

[oxford]

As far as the gears and shaft go, you may get lucky and find a direct replacement but I doubt it will be an easy quest.

You are most likely going to have to make the part from scratch, or find something close and modify it to fit.

[Edward2541]

Thanks for the info, through lots of research I was able to find the shaft from a lathe still made today. I took a $50 chance and bought a new shaft and it fits! I will have to use the bronze gear that fits the shaft I bought, for the lathe still made. I have to replace it anyway. I was wrong about where this shaft gets it's power from, it transmits power from the smooth keyed shaft below the threaded shaft to move the carriage and cross slide. I am missing the worm gear, and the worm wheel gear (the bronze gear), but the gear inside the gear case of the apron, was laying in the bottom. I have ordered the bronze gear, and will soon order the worm gear. Next on the list is spindle bearings and seals. The old bearing may be okay, but need to remove them to change the seals. I believe the Timken bearings would be better than what ever bearings came in a Taiwan lathe. I know these bearings are not ultra precision bearings by any means, but I bet they will be just fine for what I'm going to do. Any advice would be greatly appreciated, thanks!

[The Metal Butcher]

Are the spindle bearings bad?

[rdfeil]

+1 on this ^^^^^. If the seals are not really bad or the bearings truly bad you are asking for an expensive and somewhat delicate project to repair something that may not need fixing. A little leaking at the spindle seal is annoying but not a show stopper. Just keep oil available and a rag to wipe off the leaking oil. Now if you are going for a like new restoration, ignore what I have said.....

[Edward2541]

Thanks guys, I have contacted Jet, they do not support this machine anymore. however they did email a photo copy of the manual. I have found the Bronze gear, it is available from many sources, the cheapest being Grizzly tools. This gear is back ordered at every place I ordered it from, till June, from what I understand, I ordered it from 5 placed, only to be refunded my money. Meanwhile, this Lathe has turned into a full rebuild (don't they all), I think this lathe was either ran into. or fell over on the control side. The shaft that the quick change gear levers pivot on, and have slider gears to change speeds, was bent, I mean a lot. Nothing would move on this shaft without help with channel locks. Also one lever scraped on the cover, almost could not move it onto the selector plate. The speed handle on the cross slide broken right out of the handle, chunk missing, and the apron speed handle is missing.

My son Zac is a tool maker at a machine shop, he is new in this position, so he learns new stuff everyday. That being said, he made his first shaft, for me! He did a great job, it fit great. I was really lucky he was able to get it done, he is really busy, and works about 50 hours in 5 days. Almost every bearing was bad, except the Timken spindle bearings, all the seals were bad, and one was completely wrong, and I doubt ever held oil.

I came up with a way to re-install the spindle, I attached it to the tool post, after I squared it of course. After I get the height perfect, I will tighten the mounting bolts, front to back gets controlled by the cross slide, and the carriage is the in and out. Keep in mind, that the spindle has to perfectly aligned, because it has to go through 2 seals, and have a gear and pulley set pressed on while installing the shaft, I am mostly concerned with twisting a seal if I had not come up with my plan. I will let you know, if it works.

[old mart]

You are very lucky to have a toolmaker son, his skills will be invaluble. If you can get the original bearings off without damaging them, they would probably be ok to reuse. Timken bearings would be fine for 99% of home shop lathes, but in that size, not cheap. It would be easy to find replacement gears if the broken ones are present to measure the number of teeth, and the form could be checked using similar size undamaged ones from the lathe. If the number of teeth is unknown on one gear and there is a pair of similar gears meshing on the same pair of shafts, count the total number of teeth on the pair and subtract the teeth on the single one to get the number. This works fairly well if all the gears are the same tooth size.

[Edward2541]

You are very lucky to have a toolmaker son, his skills will be invaluble. If you can get the original bearings off without damaging them, they would probably be ok to reuse. Timken bearings would be fine for 99% of home shop lathes, but in that size, not cheap. It would be easy to find replacement gears if the broken ones are present to measure the number of teeth, and the form could be checked using similar size undamaged ones from the lathe. If the number of teeth is unknown on one gear and there is a pair of similar gears meshing on the same pair of shafts, count the total number of teeth on the pair and subtract the teeth on the single one to get the number. This works fairly well if all the gears are the same tooth size.

I have some info on this gear, here is what's in the parts book (Mn2X22T), it is bronze, around 2" O.D. , but to get an accurate measurement would be tough. Not only is there a piece missing, but it as also fractured and spread out. It is a worm wheel driven off of the feed shaft. If I had the equipment, I would try to make one, but do not even know where to begin measuring the old one. I guess my next step is find someone to make one. Enclosed pictures, thanks for the help!

PS the pictures were taken with a digital camera, and can be zoomed without distortion