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Knowledge You Can Build On — Est. 1998

McNaughton Centre Saver Problem - Long

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McNaughton Centre Saver Problem - Long

#1

McNaughton Centre Saver Problem - Long

George Van

>I am having a problem with the McNaughton Centre Saver, the tool torques to the right while being held up tight against the tool support, causing the tenon to break and the bowl to bounce onto the floor. The tool support is as close as possible to the bowl blanks. The wood is spalted birch. The diameter is 14�.

I have watched the Mahoney DVD and Bill Grumbine�s tutorial on his web site and appear to be following their instructions. The banjo is angled under the bowl for maximum support. I have tried the tool position slightly above, through slightly below center as judged by the spur drive mounted in the head stock by cutting a piece of PVC to fit over the tool post and cutting shavings off as I lowered the post, locking the tool post before starting to cut. The results seem the same with a noticeable movement of the tool pivoting to the right allowed by the excess width between the guide post. The movement is down and to the right, I cannot stop it and then it catches, the cut seems jerky. The movement is the same with the mini and the regular blades. The problem is not from shavings as it starts as I am not able to advance that far before it rotates. I am holding the tool at the gate as Mike shows to control the advance of the tool into the bowl.

When I use the straight corer-parting tool at the same height setting and post position the ribbons fly and a core is easily removed.

I realize I have to use a maximum tenon on the next bowl to increase the grip on the spalted wood, and maybe slow my speed however Bill seems to express the fact that you can cut too slow. The last cut with a 6� core I turned very slow. About 70 rpm. The tools are sharp.

Has anyone else have to overcome these problems? Any suggestions will be appreciated.

Re: McNaughton Centre Saver Problem - Long

#2

Re: McNaughton Centre Saver Problem - Long

Bill Grumbine, Kutztown PA

>Hi George

This might sound a bit simple, but are you using the proper space in the gate for your knife? On my gate there are two different spaces, and I think on the newer gates there are three, one for each size of knife. If you have it in the wrong one, it will move around too much and cause the problem you describe. If that is not the case, try starting the knife so that it is already over as far as it can move and see if that helps.

Bill

Re: McNaughton Centre Saver Problem - Long

#3

Re: McNaughton Centre Saver Problem - Long

George Van

>Good morning Bill, I am in the proper slot I believe, with the mini blade in the right opening and the regular in the center. I tried starting on the right side of the opening. Maybe I should try a shim from copper tubing to take up the slack. I am watching Mike�s DVD now and am wondering if the torque to down and to the right may be corrected by going still lower and bringing the circle toward the right side of the �V� tip?

BTW I enjoyed your DVD, including the fast (Priority mail) service. Ditto the others as a �Must Have�

Re: McNaughton Centre Saver Problem - Long

#4

Re: McNaughton Centre Saver Problem - Long

woodspinner/ Bill Hale

>I have had the same problem with dry wood. I slowed to about 300 and now am using the very light pressure on the handle end. It seems to be a lot easier to use on wet wood than dry. One of the things I noticed in reading is they talk about taking 5 minutes to make the cut. I was pushing it and trying to make it cut the same way I turn and it bogs.

Just some thoughts.

Good turning and be safe

Bill

Re: McNaughton Centre Saver Problem - Long

#5

Re: McNaughton Centre Saver Problem - Long

George Van

>Thanks Bill,

I am going to go down to the shop and try at 300rpm feed slowly and see if that and a shim may help.

Re: McNaughton Centre Saver Problem - Long

#6

Re: McNaughton Centre Saver Problem - Long

Gary in Zirconia,NC

>Also, by sighting down the handle towards the cutting tip, the tip should be directly in line with the handle. If it isn't it will torque to the direction the tip is. The blade could be bent.

Hope this makes sense.

Re: McNaughton Centre Saver Problem - Long

#7

Re: McNaughton Centre Saver Problem - Long

Fog Tanner

>I cut with the tip dead on center and never below. The speed varies depending on the machine. On my steel bed Delta I run it on the low range and the rpm where the motor is at peak, this translates into 600 rpm. On my Vic 300, I don't have any problems and can run at what I feel comfortable. Too slow and the motor is below its peak power range and causes stalling and doesn't do the motor a lot of good. I tried cutting down at 300 when I first got mine and it wasn't a pleasent experience, like the faster cutting speed.

I also use the original square end cutters and don't reshape them as Mike does. If you get the cutter in the wrong slot,you can have some play. I have the older two slot model, one for the jumbo and one for the standard cutter. I generally feed at what the wood will take and sometimes a little less. When cutting Mesquite, you have to be careful when you "round the curve", you go from pushing the tool to having to pull slightly. It almost wants to suck the cutter in too fast, which can cause some really interesting results (twisted cutters).

Re: McNaughton Centre Saver Problem - Long

#8

Re: McNaughton Centre Saver Problem - Long

George Van

>I talked to Mike Mahoney and he said he had the same type of problem at demo recently. He said evidently some of the gates are slightly out of spec allowing the tool tip to go too low when the tool handle therefore the blade is held upward stoutly to the stop. (Maybe this is why the fellow I bought the set from was unhappy.) Mike told me to relax my grip a little and grip near the tip of the handle and at the tool post. I tried Joe�s idea and cut at 600rpm and it worked, a little bumpy in the beginning but the blank came out without a catch!

Thanks for the help and ideas, George

Re: McNaughton Centre Saver Problem - Long

#9

McNaughton Centre Saver Problem - Long

Greg Jensen

>I am the north American rep for kelton. Please give me a call or email me you phone number and I will call you. I would like talk about this problem. If you like, send the system to me and I will check it out. If something is wrong I will correct it.

440-570-7596

Greg Jensen