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10-09-2020, 04:11 AM
Looking at making a lathe using one of a number of plans I've found. Question: is there a reason a lathe shouldn't have two live centers instead of a live and dead ones?
Mike
I work on the 50-50-90 rule: If there's a 50-50 choice, I'll pick the wrong one 90% of the time! 
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10-09-2020, 05:26 AM
If you are talking about a live center in the tail stock and another in the heard stock, the workpiece would not turn.
GM
The only tool I have is a lathe. Everything else is an accessory.
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10-09-2020, 06:09 AM
(10-09-2020, 05:26 AM)Grey Mountain Wrote: If you are talking about a live center in the tail stock and another in the heard stock, the workpiece would not turn. I don't see why not. The one center would be attached to the motor, the other would sit inside a flange bearing, why wouldn't it turn?
Mike
I work on the 50-50-90 rule: If there's a 50-50 choice, I'll pick the wrong one 90% of the time!
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10-09-2020, 06:26 AM
(This post was last modified: 10-09-2020, 06:27 AM by SceneryMaker.)
(10-09-2020, 06:09 AM)Scouter Wrote: I don't see why not. The one center would be attached to the motor, the other would sit inside a flange bearing, why wouldn't it turn? A live center, by definition, has a bearing between the point at the front and its taper at the back. This lets the point turn relative to the part it's plugged into, typically the tailstock. A dead center is all one piece so that it turns with the part it's plugged into, typically the rotating headstock.
We do segmented turning, not because it is easy, but because it is hard.
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10-09-2020, 07:34 AM
(10-09-2020, 06:26 AM)SceneryMaker Wrote: A live center, by definition, has a bearing between the point at the front and its taper at the back. This lets the point turn relative to the part it's plugged into, typically the tailstock. Okay, I understand. Since mine will be homemade the setup would be different. One center would be chucked into a 1/3 hp drill using a forstner bit, the other side would be another forstner bit in a pillow bearing. I think this would work.
Mike
I work on the 50-50-90 rule: If there's a 50-50 choice, I'll pick the wrong one 90% of the time!
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10-09-2020, 08:42 AM
(10-09-2020, 07:34 AM)Scouter Wrote: Okay, I understand. Since mine will be homemade the setup would be different. One center would be chucked into a 1/3 hp drill using a forstner bit, the other side would be another forstner bit in a pillow bearing. I think this would work. I think it's a good idea. Would be good for smaller work. The motor/chuck bearings might handle it. ▼
10-09-2020, 11:16 AM
(10-09-2020, 08:42 AM)daddo Wrote: I think it's a good idea. Would be good for smaller work. This is just for a prototype test, if it works then I have a blower motor that I can attach a rheostat to for variable speed.
Mike
I work on the 50-50-90 rule: If there's a 50-50 choice, I'll pick the wrong one 90% of the time!
10-09-2020, 11:56 AM
(10-09-2020, 07:34 AM)Scouter Wrote: Okay, I understand. Since mine will be homemade the setup would be different. One center would be chucked into a 1/3 hp drill using a forstner bit, the other side would be another forstner bit in a pillow bearing. I think this would work. Using a forstner bit in a head stock or tail stock will drill into the wood not hold the wood with any pressure put on them. I do not know how you can keep from doing that.
As of this time I am not teaching vets to turn. Also please do not send any items to me without prior notification. Thank You Everyone.
It is always the right time, to do the right thing.
10-09-2020, 11:49 AM
(10-09-2020, 06:09 AM)Scouter Wrote: I don't see why not. The one center would be attached to the motor, the other would sit inside a flange bearing, why wouldn't it turn? A live center free spins on bearings. If you have two of them then the head stock which is the drive part will allow the live center to spin but when you try to engage the wood with any tool it will stop the wood but the head stock will continue to spin. Now the other way is a spur drive in the head stock that will not spin or have bearings in it and a live center in the tail stock will allow the wood to spin but still allow the wood to be cut. There are on occasions where I put a straight pointed MT2 drive into the head stock and gently engage the tail stock to allow the wood to find its balance and then readjust until it finds it balance and change out the drive to a spur drive to drive the wood.
As of this time I am not teaching vets to turn. Also please do not send any items to me without prior notification. Thank You Everyone.
It is always the right time, to do the right thing. 
10-09-2020, 05:45 AM
(10-09-2020, 04:11 AM)Scouter Wrote: Looking at making a lathe using one of a number of plans I've found. Question: is there a reason a lathe shouldn't have two live centers instead of a live and dead ones? Some production work I've seen referenced uses two cup centers -no bearings- and friction turns the piece. I use a double spur center, not a four-spur, and a saw kerf which allows almost as easy workpiece mount-dismount.
Better to follow the leader than the pack. Less to step in.
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Two live centers?
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