Jet lathe bd-920w help

[TC Moto]

I found a jet lathe bd-920w that I got off marketplace for a good price and I’m fixing the small issues it has.

This issue has a lot of backlash, slop it seems,it doesn’t seem normal.

I’ve uploaded 2 videos on YouTube to see the issue I’m having, maybe someone out there knows something.

I also downloaded the parts manual and after looking through it, it looks like it’s all there so I’m a little stumped

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[paulsomlo]

Definitely not normal - you're missing a spacer or something. You shouldn't be able to move the crank in and out like that. Take a look at this:

. The graduated dial is the same size as the index collar, which is how it should be. Your graduated dial seems to be undersized, maybe not original?

 

[paulsomlo]

I just looked at the drawing - are part numbers 14 and 15 snugged up correctly?

 

[TC Moto]

Definitely not normal - you're missing a spacer or something. You shouldn't be able to move the crank in and out like that. Take a look at this:

. The graduated dial is the same size as the index collar, which is how it should be. Your graduated dial seems to be undersized, maybe not original?

Thanks, I’ve watched the video and it was helpful


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[TC Moto]

I just looked at the drawing - are part numbers 14 and 15 snugged up correctly?

The weird thing is that the nut or screw was missing and the key for the dial wasn’t in it either, the threads on the end of the screw that the nut goes on is a little messed up but I think I can fix it with a file

I’m starting to think it may have used parts from a different lathe maybe


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[TC Moto]

Looks like I may have a different hand wheel than what it shows in the parts manual

Mine also has a key way in it






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[TC Moto]

Another update, I think I figured out what the hand wheel is, looks like it goes to the top slide swivel base, that might explain why the lead screw for it is missing




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[mikegt4]

I have the HF version of the ubiquitous 9x20 lathe. For reference my cross slide handwheel is 50mm in diameter with one handle, the top slide handwheel is 35mm with 2 handles. You will need to have some spare drive belts on hand, there are a couple of different lengths so make sure you order the correct one for your machine. My size is 5M-710, I think 730 is the other length. They are a common size(s), readily available at industrial suppliers. Shop around for best price.

These lathes can turn out some nice parts once they are tweaked and modified. The late Steve Bedair's website is still up, a great place to start.

http://bedair.org/9x20.html
https://groups.io/g/9x20lathe

 

[macgee]

Good video you made, very helpful. The handle is definitely the wrong one and missing parts, as you've found out. There are other things going on I could say that's wrong but they don't really matter until you source the correct handle and correct associated parts. You're doing the right thing looking at the schematics and figuring out what parts go where, next is sourcing them. Please be extremely careful with the threads, they are very precise and modifying them can effect their performance. Please double check what's needed, what the correct thing maybe needed to do and then give it some time to think about it before doing any work to them.

If you need parts, try looking at Grizzly versions of this lathe and see if yours matches up with one of there's as they sell all kinds of individual parts at very reasonable (almost silly low) prices. Jet tends to ask silly high prices for their parts.
Bummer, the PO sold you the lathe like that but maybe he didn't know any better (lets hope so). The good thing is that you are far from being alone, as paulsomlo stated earlier, there is a massive amount of these being used and customized so there's a huge pool of knowledge to pull from and a good group of people who are friendly and happy to help. You may want to check out

Paulsomlo's advice on having spare belts is also really good. Nothing is worse having your only belt go in the middle of a project. They can go fast.

I also suggest checking out Hobby Machinist Forums, a lot good info and people who are quick to reply with useful info. It's a nice place to go and learn.

EDIT: Better link to use for asking help there:

https://www.hobby-machinist.com/forums/asian-lathes-mills.451/page-2

 

[TC Moto]

I have the HF version of the ubiquitous 9x20 lathe. For reference my cross slide handwheel is 50mm in diameter with one handle, the top slide handwheel is 35mm with 2 handles. You will need to have some spare drive belts on hand, there are a couple of different lengths so make sure you order the correct one for your machine. My size is 5M-710, I think 730 is the other length. They are a common size(s), readily available at industrial suppliers. Shop around for best price.

These lathes can turn out some nice parts once they are tweaked and modified. The late Steve Bedair's website is still up, a great place to start.

http://bedair.org/9x20.html
https://groups.io/g/9x20lathe

Thank you


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[TC Moto]

Good video you made, very helpful. The handle is definitely the wrong one and missing parts, as you've found out. There are other things going on I could say that's wrong but they don't really matter until you source the correct handle and correct associated parts. You're doing the right thing looking at the schematics and figuring out what parts go where, next is sourcing them. Please be extremely careful with the threads, they are very precise and modifying them can effect their performance. Please double check what's needed, what the correct thing maybe needed to do and then give it some time to think about it before doing any work to them.

If you need parts, try looking at Grizzly versions of this lathe and see if yours matches up with one of there's as they sell all kinds of individual parts at very reasonable (almost silly low) prices. Jet tends to ask silly high prices for their parts.
Bummer, the PO sold you the lathe like that but maybe he didn't know any better (lets hope so). The good thing is that you are far from being alone, as paulsomlo stated earlier, there is a massive amount of these being used and customized so there's a huge pool of knowledge to pull from and a good group of people who are friendly and happy to help. You may want to check out

Paulsomlo's advice on having spare belts is also really good. Nothing is worse having your only belt go in the middle of a project. They can go fast.

I also suggest checking out Hobby Machinist Forums, a lot good info and people who are quick to reply with useful info. It's a nice place to go and learn.

EDIT: Better link to use for asking help there:

https://www.hobby-machinist.com/forums/asian-lathes-mills.451/page-2

Thanks for the info I’ll check out the grizzly lathes

The po said he was selling it because they got new machines at there machine shop

I did order a few parts but they’re back ordered, I’ll still check out other places for other parts though, would like to get some parts quicker


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[mikegt4]

Here is another web site that is a little more Jet 9x20 specific.
https://www.micro-machine-shop.com/table_of_contents.htm#Jet_BD-920N_9x20_Lathe

 

[TC Moto]

Here is another web site that is a little more Jet 9x20 specific.
https://www.micro-machine-shop.com/table_of_contents.htm#Jet_BD-920N_9x20_Lathe

Cool thanks


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[TC Moto]

Back to the lathe, finally got my parts today from grizzly after some parts were on back order, they were originally supposed to get the back ordered parts in October but came early

just wanted to give an update, will give another update when everything’s installed

 

[rsanter]

I have a similar lathe that has been a good little machine to have even though it has some shortcomings

There is a site on the web where they talk about some of the problems and fixes of these lathes. One of the issues is exactly what you have going on there. The fix is to make a replacement piece that goes behind the cross feed dial that incorporates a ball bearing that acts as a thrust bearing holding the cross feed shaft

I also had having to use a wrench to tighten the tail stock in place so I made a camlock feature for that

 

[TC Moto]

I have a similar lathe that has been a good little machine to have even though it has some shortcomings

There is a site on the web where they talk about some of the problems and fixes of these lathes. One of the issues is exactly what you have going on there. The fix is to make a replacement piece that goes behind the cross feed dial that incorporates a ball bearing that acts as a thrust bearing holding the cross feed shaft

I also had having to use a wrench to tighten the tail stock in place so I made a camlock feature for that

nice info

 

[TC Moto]

It’s finally fixed, no more slop and it moves like it should, the right parts help a lot