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Machine Shop and Tool Talk

Slowing Down a Lathe


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  #21  
Old 07-15-2019, 11:48:51 PM
tdmidget tdmidget is offline
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Default Re: Slowing Down a Lathe

Motomowers has it: the spindle sheave has been modified for a Vee belt. I'm not sure but I believe that is integral with the spindle so you are not going back to a countershaft arrangement. Dalmatiangirl is right, you need to get that machine and drive train mounted securely and in an area clean enough to work. The machine may be a small lathe but it is waiting for a chance to show you that it can kill. It doesn't need a head start by jumping off of saw horses with a rotating workpiece in it. Read "How to run a lathe" by South Bend. Get some help setting up and aligning your power train. Go slow and be careful. By the way, most people are wishing such machines ran faster, not slower.
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  #22  
Old 07-16-2019, 02:11:14 AM
cobbadog cobbadog is offline
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Default Re: Slowing Down a Lathe

Once again the regular guys here have come to the rescue of Scott as they did for me some time back and I find it amazing how they all want to help and see you get up and running safely.
I'm sure that Scott as I am still thankful for all the help being offered no matter what the level of question or ability of the posters.
Thank you !
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  #23  
Old 07-16-2019, 07:27:25 AM
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Default Re: Slowing Down a Lathe

Quote:
Originally Posted by Scott Kocher View Post
corn binder I think you are right . yes there is a lever to the left behind the main shaft with a set of gears. like you said when I pull or engage that lever it locks the main shaft for removal of the jaw chuck. so when this is engaged it will run at a slower speed?

To get it into back gear you have to pull the pin on the big spindle gear out. Then it works. When you're done using back gear, flip that gear set back and push the pin back in for direct drive.

**Be careful using back gear with the locked spindle to remove the chuck. Mine was stuck from sitting twenty years when I got it and stupidly I put a lot of grunt on the chuck to loosen it. I broke a tooth on the $$$ back gear pair.
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  #24  
Old 07-16-2019, 01:01:43 PM
CharlieB CharlieB is offline
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Default Re: Slowing Down a Lathe

That Vari-drive is a wonderful thing to have. I would look into mounting the motor on top of it. That way it would take up no more floor space than a lathe/motor assembly. Still not small enough? Build a frame to mount the whole works above the lathe. I did this once with a 4-speed truck transmission (on a little larger lathe) and it worked great.It looks like the Vari-drive has not been used with the lathe. The belt size on the lathe doesn't match the grooves on the Vari-drive. One fix would be to swap the belt out for a V-flat belt.
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  #25  
Old 07-17-2019, 08:57:17 AM
M.Canute M.Canute is offline
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Default Re: Slowing Down a Lathe

Quote:
Originally Posted by tdmidget View Post
Motomowers has it: the spindle sheave has been modified for a Vee belt. I'm not sure but I believe that is integral with the spindle so you are not going back to a countershaft arrangement...........
The spindle sheave is separate from the spindle itself.

---------- Post added at 08:57:17 AM ---------- Previous post was at 08:32:43 AM ----------

Quote:
Originally Posted by I like oldstuff View Post
..........**Be careful using back gear with the locked spindle to remove the chuck. Mine was stuck from sitting twenty years when I got it and stupidly I put a lot of grunt on the chuck to loosen it. I broke a tooth on the $$$ back gear pair.
When I first acquired my 9" SB I locked the back gears and put a crescent wrench on one of the chuck jaws and then just used the palm of my hand to bump the wrench thinking I couldn't be hitting it that hard but I was wrong; I broke off two teeth. Another 9" SB I acquired came with a couple of teeth prebroken and I have repaired them by having the gap built up with brass and then recutting them with a nice gear cutter from China.

The latest SB I acquired had a stuck chuck and I tried just about everything to loosen it including with and without applying heat and a 3/4" impact wrench on a hex shaft held in the jaws while the outboard end of the spindle was held in a two foot long wrench I made specifically to fit the end 360[sup]o[/sup] and clamp down on it with two bolts and with a pin that went through the end of the spindle. I also tried a 12 inch crescent wrench on one jaw with a pipe extension and nothing would move it. I'm over 250 lbs and trust me, I put my fat behind it but no go. I ended up chucking the spindle with stuck chuck in my other lathe and I used a narrow cut off tool to cut through the backing plate as close as I could to the spindle. Once that was done it was totally lose. Unfortunately I'll have to find another chuck for it since the scroll is worn out.
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Old 07-17-2019, 09:08:01 AM
ronm ronm is offline
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Default Re: Slowing Down a Lathe

Quote:
Originally Posted by CharlieB View Post
That Vari-drive is a wonderful thing to have. I would look into mounting the motor on top of it. That way it would take up no more floor space than a lathe/motor assembly. Still not small enough? Build a frame to mount the whole works above the lathe. I did this once with a 4-speed truck transmission (on a little larger lathe) and it worked great.It looks like the Vari-drive has not been used with the lathe. The belt size on the lathe doesn't match the grooves on the Vari-drive. One fix would be to swap the belt out for a V-flat belt.
This...figure out a way to make it work.
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  #27  
Old 07-17-2019, 09:16:51 AM
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Default Re: Slowing Down a Lathe

Make something like this to lock the spindle for chuck removal. It works slick and you can put all the grunt you need to unscrew it without using the locked back gears.
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  #28  
Old 07-17-2019, 10:21:49 AM
Pete Spaco Pete Spaco is offline
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Default Re: Slowing Down a Lathe

Wow! This stuck chuck thing is sorta scary.
I have been removing chucks using the locked back gear method on my Atlas lathes for almost 50 years without mishap. I wonder how the chucks get stuck that tight in the first place.
The machine shop instructor at a vo-tech even taught that method, by the way.
Instead of using a Crescent wrench on a jaw, I put a piece of 1 X 4 wood about 12 inches long between two jaws and bop it with a lead hammer. Always works for me.
Of course I always carefully clean and oil the spindle and the chuck that's going back on.
Now that I say all that, I wonder if, maybe, it's the SHARP tap that works better than just brute strength.

Pete Stanaitis
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  #29  
Old 07-17-2019, 11:17:44 AM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Slowing Down a Lathe

Oldstuff
I'm not quite understanding how that plate locks the spindle, are there flats on the spindle?

Pete
I never had a problem getting chuck off my Atlas either, have yet to get the chuck off the Logan, been wondering if someone thought that was a good application for loctite
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  #30  
Old 07-17-2019, 12:03:58 PM
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Default Re: Slowing Down a Lathe

Quote:
Originally Posted by dalmatiangirl61 View Post
Oldstuff
I'm not quite understanding how that plate locks the spindle, are there flats on the spindle?
The big gear on the spindle is an iron casting. And yes it has two big lugs on it. One side has the pin that is used to lock or unlock the gear to the spindle. The other side 180 degrees away is just the same metal mass without the hole for the pin. I made the tool gizmo to hold this bare cast lug and rest on the main head so I can reef on it if needed.

Pics are the lug thingies for that tool to grab onto.
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  #31  
Old 07-17-2019, 07:57:09 PM
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Default Re: Slowing Down a Lathe

ok guys I got the vary speed box working you guys are correct in needed to be running in order for it to work . next step is to try to mount the motor on top of the vary speed . did locate the small pin to disengage the lock for the spindle the back gears do work . I am not mounting it to the saw horses its just there to be cleaned up. I will build a sturdy bench for it to sit on & bolt her down to it . like cabbadog said I am very grateful for all the advice every one has contributed . I will post picture's as I move along with this project
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  #32  
Old 07-18-2019, 03:43:15 PM
Sonny Reese Sonny Reese is offline
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Default Re: Slowing Down a Lathe

I have a big sb lathe that was line shaft driven. It has a short piece of the lineshaft and flat belt drive, 3 step pulleys and the other end has a big v pulley to hook a motor to. It has back gears and lead screw with the half nut. I still don't have it set up, but in need of a big reversable motor for it. I was told it needs 2 hp min. to run it.
Mine is all cast iron, legs and all.
A friend said that you can find sb lathe books on the internet but I haven't had time to look them up yet. Thanks; sonny
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  #33  
Old 07-21-2019, 11:36:09 AM
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Default Re: Slowing Down a Lathe

ok guys I didn't get any books yet on this lathe.
but my next dumb question is
when mounted to legs what height should they be off the floor ?
but I guess that's a personal preference
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  #34  
Old 07-21-2019, 01:12:55 PM
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Default Re: Slowing Down a Lathe

Yup, mount it at a height that suits you.
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  #35  
Old 07-21-2019, 01:21:45 PM
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Default Re: Slowing Down a Lathe

You should set the height so that you do not have to stoop or lean over to operate any of the controls.
One standard I have heard of is to have the cross feed dial at elbow height. This will place your forearm level when turning it. This should also have the longitudinal feed wheel within reach without bending.
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  #36  
Old 07-28-2019, 03:02:09 PM
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Default Re: Slowing Down a Lathe

ok guys another dumb question
if I have a 9" swing I should be able to run a 8" jaw chuck correct
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  #37  
Old 07-28-2019, 03:17:00 PM
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Default Re: Slowing Down a Lathe

Yes. But being that large it won't go over the carriage. 5 or 6 inch chucks are typically used. And the thread on the spindle is 1 1/2x 8 thread
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  #38  
Old 07-28-2019, 04:23:55 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Slowing Down a Lathe

Quote:
Originally Posted by Scott Kocher View Post
ok guys another dumb question
if I have a 9" swing I should be able to run a 8" jaw chuck correct
Yes, but you will be limited to size of stock it can hold as jaws will not be able to protrude more than 1/2" before hitting the ways. 6" chuck would be a better fit imho.
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  #39  
Old 07-29-2019, 06:10:22 PM
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Default Re: Slowing Down a Lathe

hey I like old stuff are you sure its not 1 3/8"
that's what I have also do you know were I can find a good 3 jaw chuck for it
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  #40  
Old 07-29-2019, 11:11:45 PM
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Default Re: Slowing Down a Lathe

My 9 is 1.5 and I thought they all are. Been wrong before though.

You can spend a ton or go cheap. If it's occasional use, maybe one of the chinese ones on ebay or perhaps this guy I buy from.
http://www.cdcotools.com/
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