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Back Spindle Spider

 
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  #15  
Old 07-27-2013, 08:05 PM
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Re: Back Spindle Spider

Quote:
Originally Posted by shortgrass View Post
But,,,, what about the split nut????
The 'split nut (s) belong to the unfortunate hunter who attempted to cross the fence and slipped halfway over.... OUCH.

Somehow, you can't compare that Grizzled one to a Hardridge or any second operation lathe. Well, maybe the uninformed can....

That little machine reminds me of a glorified Harbor Freight copy...

Back to the spyder......

Not much bore on that machine. Maybe a 17 HMR barrel perhapse?

BTW Jinx, it's most likely Diametrical Pitch. Most imported machines use that thread.

I think you are over engineering it. You have enough material proud of the thread (OD on spindle) to machine a tight slip fit collar with 3 opposing setscrews to secure it. The only thing an outboard spyder does is keep the barrel in alignment. It really carries little load and I suspect the outboard nut on the spindle preloads the inner nut which adjusts the freeplay.
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  #16  
Old 07-27-2013, 09:04 PM
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Re: Back Spindle Spider

SidecarFlip, you right there are no compersion between two, maybe just one, that once threading is engaged it stays that way, nothing more

The Harbor freight is this one it has 12" between centers with 3/4 bore


So about bore capacity, why would you say its limited to17HMR?

About that machine, originally I wanted to buy Grizzly's gunsmiths benchtop lathe, but when I got there I decided that I need milling machine as well, so I had to squeeze both in my budget so here I am...

shortgrass you can call them both, I guess it goes with geography





also I worked with Clausings, Monarch and Leblond I think you right about half nut

Last edited by Jinx-); 07-27-2013 at 09:27 PM. Reason: half-nuts ;-)
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  #17  
Old 07-27-2013, 09:59 PM
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Re: Back Spindle Spider

You can mill with an engine lathe. I do it ocassionally. Just pull the toolpost and replsace it with an angle plate and small machinists vise and viola! you have a mill. Of course a collet closer on the headstock to grip mills is nice but optional. A keyed drill chuck on the spindle nose works too, or iuf your spindle is DI/camlock, the appropriate backing plate.

Yoy actually have a lot of travel capacity as well.

Palmgren makes a dandy milling vise for your compound as well. I have one sitting on the shelf btw, like new that I might sell.
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  #18  
Old 07-27-2013, 10:15 PM
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Re: Back Spindle Spider

I knew it! I should of gone to Harbor freight instead, they do sell engine lathes, but I see no similarities with what I got



but I got my lathe from Grizzly with 3 axis mill and if I would pay 3 times more, then the mill cost I can upgrade to CNC ;-) they sell all of the steppers and controllers in conversion kit
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  #19  
Old 07-28-2013, 02:16 AM
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Re: Back Spindle Spider

Just an update, "Spider" taking shape, next step drill and tap
and I hate them needle like chips-splinters

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  #20  
Old 07-28-2013, 06:45 AM
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Re: Back Spindle Spider

Got some chatter marks inside. Boundary lubricant is nice when machining......

The HF lathe looks like a ______ model. Different paint. Same manufacturer, over there somewhere.
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  #21  
Old 07-28-2013, 09:12 AM
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Re: Back Spindle Spider

Chatter is from 3.25" long boring bar I used which is only .300 OD, it has brazed carbide tip. So its combination of deflection and its need to be resharpen again. I like to use carbide, since I can use higher feed and speed. As far as functionality for spider I didn't see any need for a clean pass, but I can do a touch-up if its going to make it function better.


Last edited by Jinx-); 07-28-2013 at 09:53 AM.
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