New To Me, Jet 1336pbd - With Some "issues"

Well, I was in the big city of Billings, Montana today. They have a Motion Industries location, so I stopped in and asked about high precision bearings to replace the NSK bearings that were in this. The Customer Service Representative really spent some time with me. She called both Timken and SKF while I was there to see if either one had high precision bearings in the ISO sizes 30211 and 30212. Unfortunately neither did. SKF said that they could do some if I wanted to purchase a large quantity. Because I don't even know if I could afford one set of "super precision" bearings I surely didn't want a quantity of them. I ended up telling MI to order the Timken 30212m and that I would take the 30211m they had in stock. I'll pick them up in March when I'm there again.


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Yesterday I went to visit the widower husband of a lady I worked with for the past ten years. She passed away just a week before I retired. He asked me on Sunday night if I would like to go on a "fun run" with him, which really does not involve my running (much to my relief) but rather involves 4 1/2 hours of running four wheelers or UTVs through deep snow, much like a roller coaster that left its track!
It was a lot of fun and I enjoyed myself. However, while visiting with him in his shop before we went on this Fun Run, we were talking about tools and I was admiring his neat-as-a-pin shop, when I mentioned that I used to have a Unimat. He got a funny look on his face and beckoned me over to a set of shelves. From it he pulled a familiar looking box. In it was an old SL (DB-200) Unimat. Then, he gave it to me, just like that. I'm 60 years old, but when I opened the box and looked at the various parts and accessories I had that same old thrill I had forty some years ago when I ordered and received my original Unimat. I'm stoked to have this. I'll post a few pix tomorrow.


Steve Shannon, P.E.
 
Steve,

Glad your friend gave the lathe to someone who appreciates what he has received. I got my first lathe about 40+ years ago and in a moment of weakness I traded it to fellow forum member a few years ago. I have regretted it since.

This hobby is a sickness and we grow sicker with age. I only have four lathes right now and only one of them is operational. I need to clean house.:)

Don't let this one get away from you.

Benny
 
Steve
I have the exact lathe as you. The tag says Made in Taiwan.
Got tired of all the play,slop,and vibration and started learning to scrape.
Been doing it " on the cheap " but it's still expensive and has been greatly time consuming.
The learning experience has often been frustrating with a lot of ,O Crap, moments.
Still there has been the satisfaction of seeing greatly improved finishes, faster machine cycles, rigidity is greatly increased so I can now zoom right through parting operations that it couldn't handle before and
I'm learning a new skill.
I also recently tried to get new bearings and found the same result as you.
Considering the cost of the "P" or grade 5 bearings you might think about just installing truck bearings. Since the main load bearing isn't available and that one expensive bearing on the OB end won't do much
by it's self.
 
Thanks, tertiaryjim. Both bearings were available and arrive at the dealer today. I'm going back to Billings in two weeks. I'll pick them up then. Specs say that both Timken bearings have a runout somewhere about 25 microns, if I remember correctly. I think that anything I'm likely to build can be done with that accuracy.
What brand/number of main bearing did yours have?


Steve Shannon, P.E.
 
Bearings are HR 30211J and 30212J
Just went through all 4 pages of this thread and found where I might have helped early on.
If you still have any questions I will gladly try to answer them.
 
tertiaryjim said:
Bearings are HR 30211J and 30212J
Just went through all 4 pages of this thread and found where I might have helped early on.
If you still have any questions I will gladly try to answer them.
Click to expand...
That's exactly what mine were. I don't know if it's an upgrade or not, but I went with the Timken. I might even get one of the Timken decals and put on this.


Steve Shannon, P.E.
 
Just remembered that the spindle threads are metric.
Will check them when I next change chucks but memory says they are very close to 8 tpi
Don't have a metric pitch gauge that goes over 2mm but could measure them with calipers.
Think it's a 3mm pitch.
 
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