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Old 09-17-2010, 07:57 AM   #1 (permalink)
 
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Default Turning between centers - bushings

I know there are specially made bushings for turning between centers, but does one need them? Or can you use mandrel-type bushings to turn between centers?
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Old 09-17-2010, 07:58 AM   #2 (permalink)
 
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Quote:
Originally Posted by azamiryou
I know there are specially made bushings for turning between centers, but does one need them? Or can you use mandrel-type bushings to turn between centers?
The ones made for turning between centers are much more accurate in my opinion.

Michael
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Old 09-17-2010, 08:02 AM   #3 (permalink)
 
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For any TBC bushings, I don't use anything but JohnnyCNC's bushings. They are more accurate than mandrel bushings. Thats not to say "you cant use mandrel bushings", cause I've had to use them in a pinch. But the first thing I did the next day was send Johnny an order (http://penturnersproducts.com/)
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Old 09-17-2010, 08:04 AM   #4 (permalink)
 
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You can use regular bushings unless you are trying to turn slims or euros. Both of those do not go in the tube so they would not support the blank. That being said I do believe that the between centers bushings are nicer to use but I don't necessarily think they are more accurate else pen turners would not have been turning nice pens before these came about.
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Old 09-17-2010, 08:09 AM   #5 (permalink)
 
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Who says you need bushings? I don't use them. Just make sure you don't crank it down, ans you should be fine without. Works for me.
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Old 09-17-2010, 08:20 AM   #6 (permalink)
 
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I used the regular bushing when I did this...

http://www.youtube.com/watch?v=xYFhRINVDDE

because I don't YET have johnnycnc bushings for this particular pen.
Don't let that stop you from trying it out!


Last edited by Lenny; 09-17-2010 at 08:23 AM. Reason: still don't know how to embedd the video =0(
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Old 09-17-2010, 08:39 AM   #7 (permalink)
 
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Like this, I think:




Success!
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Last edited by rjwolfe3; 09-17-2010 at 08:41 AM.
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Old 09-17-2010, 08:54 AM   #8 (permalink)
 
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Quote:
Originally Posted by rjwolfe3 View Post
Like this, I think:




Success!
Me too!! I need to get one of those tools!
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Old 09-17-2010, 09:04 AM   #9 (permalink)
 
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Stock bushing will work in most instances as mentioned above. But not all stock bushings are made good enough for even mandrel turning. Many have been found to be non-concentric to start off with.

Johnny's bushings are a vast improvement over the stock ones in several ways. 1) they are concentric 2) the sizing is a much tighter spec (you can make popping noises when pulling the bushing out of the tube) 3) much tougher metal, so they last a lot longer.

And that's just the few off the top of my head.

So yes, you can (and I still do) use stock bushing for between center turning, but upgrade to Johnny's if/when you can and you won't regret it.
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Old 09-17-2010, 09:29 AM   #10 (permalink)
 
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Quote:
Originally Posted by Russianwolf View Post
Stock bushing will work in most instances as mentioned above. But not all stock bushings are made good enough for even mandrel turning. Many have been found to be non-concentric to start off with.

I'll bet you are right on with this! If you have trouble with "out of round" on a mandrel and then try TBC with stock bushings and still have trouble, it would be a pretty good guess that the bushings are part of the problem.
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