Tapered Candle Holders With Opposing Twists

[SteveNelson46]

Dan Bergerud and I have been conversing on modifications to the original Carvewright Rotary Jig to make it a little easier to use and to calibrate. This is my first project after making most of his modifications. It's an old project that I have made before and one of the more complicated ones so I thought it would put the new modifications to a really good test. The calibration test only needed a slight advance using the arrow keys on the first attempt. After that, I ran it several more times turning the machine off and removing the jig between each try and each one was dead on the money. No adjustments using the arrow keys to advance or retard the rotation was necessary on all successive attempts.

The project itself ran perfectly the very first time and made a full revolution plus about 5% when I forced the over-carve.

I cannot overemphasize my gratitude to Dan for all of his hard work, thought and planning to make this happen. At least for me, the jig is now an absolute joy to use.

The wood is Cherry and they are about 11" tall and about 2 3/4" in diameter.

[DickB]

Those are really cool candle holders. Congrats to both of you on the success of the refinements to the rotary jig. I may have to get one someday!

[oscarl48]

Steve, beautiful candle holders and great looking design.

[bergerud]

I am so glad to hear you have the jig working so well. And, those are very nice rotary carves.

[rcdages]

You should turn the Candle Holders in to a Project
for sale.

[SteveNelson46]

You should turn the Candle Holders in to a Project
for sale.


Thanks to all for the great reviews

The procedure I used was:

1. Turn the blank into a 11 1/2" long by 2 7/8" diameter round dowel (round is optional but length needs to be exact).
2. Drill a 3/4" diameter hole through the center lengthwise (hard to do without a lathe but possible).
3. Turn a 2" long, snug fitting plug for both ends of the blank and glue them in flush with the end.
4. Mount the blank in the jig and carve.
5. After the carve is finished, Trim off the waste on both of the ends.
6. Drill a 3/4" diameter hole about 3/4"deep in the top end.
7. Remount in the lathe and sand a slight concave surface on the top around the hole.
8. Hand sand or use a detail sander for cleanup and flat bottom.

I could turn this into a project for the Pattern Depot but it would have to be an advanced advanced project. The hole has to be drilled through the center first and then plugged on both ends to fit in the jig. Normally this would involve the use of a lathe. I suppose one could use a drill press for the hole or even drill it with a hand drill and then buy a dowel to fit the hole but dowels are rarely the exact size the say they are and a tight fit is required. There are lots of other considerations and possibilities but, from my experiences, the Carvewright machine cannot be used exclusively.

Before the modifications to the jig there were quite a few trial runs before finally getting an acceptable procedure and finished project. After the modifications the projects ran perfectly the first time. Both MPCs are included here so anyone can give it a try. Designer 3 is required.

[Sliverfoot]

Beautiful work.
Speaking as someone that is still always learning the Carvewright I am thankful for guys like you two are always expanding our horizons.

[cestout]

Is someone going to tell us about the modifiction to the jig?
Clint

[DickB]

Is someone going to tell us about the modifiction to the jig?
ClintLook here: http://forum.carvewright.com/showthread.php?28089-CW-Rotary-Jig-Direct-Drive-Rail

[SteveNelson46]

Is someone going to tell us about the modifiction to the jig?
Clint


Clint,

Dan and I have been using the Senior Member Forum to discuss the modifications. See post #1 and post#17 here:

http://forum.carvewright.com/showthread.php?28089-CW-Rotary-Jig-Direct-Drive-Rail

You can also read my posts to see what I did and what worked for me.

Since they are his modifications I don't feel comfortable publishing them here in the general forum.


(http://forum.carvewright.com/showthread.php?28089-CW-Rotary-Jig-Direct-Drive-Rail)

[mikemi]

Look here: http://forum.carvewright.com/showthread.php?28089-CW-Rotary-Jig-Direct-Drive-Rail

Is the contents of this link for Senior Members only? When I click on the link, it takes me to a page that says that I don't have permission to view the contents of that page.

Mike

[bergerud]

I am sorry but this was a thread I started on the senior's member forum last year to see if any senior members might want to experiment with this drive rail idea. I did not want, at the time, to post this on the open forum. So far, Steve is the only one who has taken on the experiment. The following is the original post:

CW Rotary Jig Direct Drive Rail

I have experimented quite a bit trying to find out why calibration of the CW rotary jig is so dependent on head pressure. I have put rails under the jig. I have added other pulleys. I have driven just the belt on the wheel and so on. My conclusion is that the toothed belt rolling on the smooth idler pulleys is where it goes wrong. Differing amounts of head pressure cause differing amounts of distortion to the belt as the teeth are pressed against the smooth idler pulleys. If the idler pulleys were sprockets instead of smooth pulleys, I think it would be better. It is a very sensitive thing where small errors really add up.

In any case, I will show you what does work. I bought some 72 tooth HTD 3M 216 belts to fit right on the drive wheel. I got 10 mm wide ones as two fit across the wheel. I took off all of the pulleys and put a simple wooden rail under the drive wheel. I added a thin strip of grip tape around the two belts. The resulting setup does not have the calibration issues.This was just an experiment for me since I use my own rotary jig. I just thought someone might want to give this setup a try.

[normrichards]

I for one would like to know more, the pics do not show up for some reason.

[SteveNelson46]

This is a copy of my last post on the Senior Members Forum about the modifications

I still haven't received the belts from AliExpress so I just went with 2 layers of non-skid tape on the geared wheel. Everything seems to be working great. My first project since the modifications was the candle holders and I posted them on the regular forum. They were both about 6 hour carves and they carved perfectly. The rail was made as thin as possible so the end plate was very close or actually touching the alignment plate after compression. On my machine it turned out to be 1" exactly. Anything less will cause the rail to slip on the belts. The shim on the other end ended up to be 5/64" to make the jig level. It was made out of hard maple but hasn't been glued on the jig yet. The shoe was made out of hard Maple also. I traced your outline so it could be made it into a pattern. It could then be pushed to the bottom of a 3/4" board so it didn't have to be planed to 1/4" thick. This also made the use of a sled unnecessary. After carving, the shoe was too wide to slip through the space between the belts without splitting it in half and sliding the two pieces back together under the sliding plate lock. It still worked great though.

I can't thank you enough for making the jig truly functional.

After removing all belts, idler pulleys and bearings, the jig actually rests on the alignment plate on the left and the sliding plate on the right. The shim refers to the spacer between the sliding end plate on the jig and the sliding plate on the machine and levels the jig. The shoe refers to a spacer Bergerud made to slide under the sliding plate lock to keep the sliding plate from flexing and rubbing on the belt. I used a small wedge on a couple of test runs and it worked fine.

[Wood Art 1]

Steve, I really like your candle holders. The minor issues that I've had with the rotary jig have prevented me from tackling a project that extensive. Always had difficulty in getting the end of the carve to meet. Always have about a sixteenth of an inch uncarved. Somewhat awkward when carving bar-tread tractor tires.
Like Normrichards I would like to see the modifications to upgrade my fixture also. Dan has designed some fabulous fixtures to assist the rest of us. If you would please post the pictures, I would make the modifications to my rotary. Thanks to Steve & Dan for their work.

[bergerud]

I fixed the pictures. (Copy and paste did not work before.)

[SteveNelson46]

Steve, I really like your candle holders. The minor issues that I've had with the rotary jig have prevented me from tackling a project that extensive. Always had difficulty in getting the end of the carve to meet. Always have about a sixteenth of an inch uncarved. Somewhat awkward when carving bar-tread tractor tires.
Like Normrichards I would like to see the modifications to upgrade my fixture also. Dan has designed some fabulous fixtures to assist the rest of us. If you would please post the pictures, I would make the modifications to my rotary. Thanks to Steve & Dan for their work.

There really isn't much to take a picture of that Dan hasn't already done. The only thing that I changed was to use 2 layers of non-skid tape instead of a belt that fits tightly around the geared wheel and one layer of non-skid tape. If you are willing to sacrifice your existing belt you can cut it to fit around the geared wheel and just use one layer of non-skid tape. Just make sure the seams are on the opposite sides of the wheel. I will go out to my shop and take some pictures of the jig in the machine. It may help.

The geared wheel needs to make 3 full revolutions for calibration and only one revolution for carving. So the calibration rail needs to be about 36" long and the carving rail only needs to be about 14". Both rails are exactly the same except for the length. You could use the calibration rail for carving. It just sticks out of the machine.

After calibrating the jig the first time successive calibrations are not necessary. I did it about 10 times because I just couldn't believe it would be that accurate. But it was. Even after turning the machine off and removing the jig between each calibration test.

The modifications also fixed the incomplete carving revolution problem.

[cestout]

I saw that but wasn't sure that was what you were talking about. That puts us back to the old home made jig I just put in the firewood pile. The biggest problem I see is that it reverses everything.
Clint

[SteveNelson46]

I saw that but wasn't sure that was what you were talking about. That puts us back to the old home made jig I just put in the firewood pile. The biggest problem I see is that it reverses everything.
Clint


Clint,

I'm not quite sure of what you are referring to. The modifications only amount to removing everything on the jig that moves except for the geared wheel, adding some non-skid tape, adding a shim under the jig's sliding end plate, adding a spacer under the sliding plate lock and, of course, the rail.

[SteveNelson46]

Here is a picture of the jig, with the modifications, installed in the machine. The left end of the jig is on the squaring plate and the inside edge of the jig is flush with the inside edge of the squaring plate. The rail is against the squaring plate and against the inside left end of the jig. The shim is sandwiched between the top of the sliding plate and the bottom of the sliding end of the jig. The inside face of the jig is also flush with the inside edge of the sliding plate but it's hard to see because the shim is 3/4" wide. It was intentionally left that way so it would be easy to grasp and adjust. The shim was also notched to fit a little deeper around the mounting screws of the sliding plate lock (not shown). The shoe that slides under the sliding plate lock is also not shown.

Notice the small amount of space between the inside left end of the jig and the geared wheel. This was accomplished by adding a washer between the end plate of the jig and the geared wheel bearing. Also, while the wheel was off, I made the counter-sinks for the mount screws on the inside face of the wheel a little deeper so the heads of the screws don't rub on the inside face of the jig. This was another modification by Bergerud awhile back.

All of the modifications shouldn't take more than one to two hours and if you are willing to spend the time to make them I think you will be amazed at the difference in performance of the jig.

[bergerud]

I saw that but wasn't sure that was what you were talking about. That puts us back to the old home made jig I just put in the firewood pile. The biggest problem I see is that it reverses everything.
Clint

Actually it does not reverse the carving direction. The rotary jig software already runs in reverse. The direction of the CW rotary jig is the same with the rail as it is with the belt.

[mikemi]

Thanks Dan & Steve for the explanation, It makes more sense now.

Mike

[cestout]

ok,your picture and some mental picturing helped. Is there a possibility the you 2 could put together a how to PDF with pictures and measurements etc?
Clint