My Captive Hollowing Rig

Re: My Captive Hollowing Rig

Jim Ketron

>another look

It'll work better....

Terry Daniel

>if you turn the "D" handle over. You'll get less vibration.

TD

Re: It'll work better....

Jim Ketron

>Terry I really dont see how turning the D handle over would make any difference it does the same function I have not used it yet to find out.

Can you explain how it would?

Re: It'll work better....

Terry Daniel

>I can't tell you how or why but I can tell you that it works much better if flipped. Try both ways and let us know what you find out.

TD

This would be interesting.

Barry Irby

>I don't have a captive system, but I can see how it might matter. If the restraining part of the D handle is to the font the way you have it, when the cutter meets resistance it will tend to urn down, lifting the shaft until the D handle retrains it. If you turn it the other way, it will tend to rotate the shaft until it lifts the D handle, but may not lift the shaft off the rest. It would be a slight difference and it would be interesting to know if it matters.

Re: This would be interesting.

john Lucas

>The idea behind the captive bar system is to get the cutter on center and keep it aligned. This causes very little torque unless you are using an offset bar. Even the curved bars are bent so the cutter is inline with the central shaft so if you keep the tool rest on the straight part of the bar there still isn't any torque to speak of.

I've tried the "D" both ways on mine sometimes just to get the cutter in a different position inside the vessel. I can't tell that it makes any difference.

curved tip

Terry Daniel

>John, you may be correct re: the curved tip. I was getting a LOT of chatter when going deep (14") with a curved tip and the extra heavy shaft, then I flipped the "D" handle over and was amazed at how much less vibration I had. I would suggest everyone give this a try. it certainly does not hurt anything and I think it helps a bunch but I just started doing this so I need a little more time before I can really be authoritative about it. For now I can only suggest that it be tried by all who use the "D" handle. Please post the results.

TD

Re: curved tip

Brad Vietje

>That's interesting -- I was inclined to agree with John that I had not noticed any difference, having used the D-handle on both sides, but wondered if the D away from the turner would counterbalance the torque somehow. My rig can be adjusted to take out any play in the parallel bars, so it can be set to ride pretty smoothly. I've only used it to about a 12" overhang though; Terry was probably making a 6' diameter urn !

Safe Spinning,

Brad Vietje

Thetford, VT

Re: curved tip

Jim Ketron

>I used it this weekend had no problems with vibration so I didnt flip it over. This is built heavy duty with schedule 40 pipe.the braces are welded for a snug but free moving with ease fit the D-bar does not twist or have any up-down movement. I really dont know what most are made of but looks to be aluminum.

So im very pleased with its performance so far I will be putting it to the test in the next few weeks and months.

Thanks

Jim