Logan 200 Lead Screw Speed And Chuck Removal

vincent52100

vincent52100

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Good evening. I have a Logan 200 with a couple of issues. They may be a lack of knowledge on my part. The lead screw speed seems to be a bit fast. I can't really get a good finish, it looks kind of like threads although very close together. The gear on the lead screw is 72 teeth. The gears on the idler are 60 and 32 teeth. Does that seem like a good speed?
Also I can't remove the 3 jaw chuck. I'd like to install the 4 jaw but don't want to damage anything getting the chuck off. Thanks
 
I can't help with the gear selection, but there's a number of things you can do to remove the chuck.
I locked a long hex nut (a threaded rod connector) in the chuck and used a socket and a breaker bar to pop it loose. I was also worried about breaking parts, so I avoided locking anything up. I believe other folks used soft wood into the gears to jam them up to have something to turn against.
 
Look at the following. I usually run in some configuration of figure #3. Which figure is your lathe set up now? And what gears do you have where? Also, do you have a full set of gears? If not what do you have?Capture.JPG
 
Thanks for your answer. If I'm looking at figure 1 right the spur gear is 18t, the big idler gear 60 and the small is 32, the screw gear is 72. I don't have any other gears. The machine came with a set of change gears but their not for this machine (the PO said that they would not fit). I intend to make a list of them and see if someone can identify. Maybe I'll be able to trade them with someone. I'll post pictures and dimensions. Thanks
 
LOL, I was just going to say post a pic ... and you did before I posted. That configuration is not even on the charts ... had telling what thread pitch you are actually cutting. Here is what the lathe would have had for a full set of gears. You don't need all of them, acquire them as you go and as the need arises. But to start with I would get a 24, 54, & 48 ... that way you could set up like pic #3 and have your 32 on the stud and the 72 on the screw. That would give you .0092"/rev.

I do have some extra gears, I can inventory once the temps break and let you know.
Oh, nice looking lathe as well (presuming its the one in your avatar).
Capture.JPG
 
Thanks! Yep, thats the one. Really happy with it. I've done a couple of small things with it, not complicated parts but expensive to buy.
 
Oh and to set up like diagram 2 or 3, you will need another stud assembly like your 60 & 32 are mounted on.
 
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