Jig question and new spiral

[myxpykalix]

Here's another one. I'm not pleased it was vibrating too much because of the depth of cut and my jig has no real height adjustment.

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Which brings me to my question. I would like to find some type of device as illustrated in my side view of the jig and material. Forgive the lousey artwork.
Does anyone know of any type of small device i could use to raise the height by turning a knob to raise the height of the jig to compensate for the cutting away of material? Some type of screw jack or router lift type of thingamajiggy?

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[wooden_innovations]

How about something that looks like a small car scissor jack.

You could cut some wood screws and make your own.

[myxpykalix]

yes if i could find something like a scissor jack that was an inch or two tall that would work.
There has to be some type of small tool lift or something that someone knows about.

[wooden_innovations]

This link has a picture of a design that you could copy:

http://www.sciencelab.com/page/S/PVAR/20493/10-90012


This foot stool could be modified to suit your needs


http://www.music123.com/ProLine-FretRest-Deluxe-Guitar-Footstool-454317-i1168482.Music123

[myxpykalix]

Thanks Rodney that first link is the idea i'm thinking about but it needs to be smaller. I only need 2-3" under the stock and the wheels are at least 2". So i'll need to find something small and figure a way to adapt it.

[jerry_stanek]

Why not cut a cople of wedges and drill a hole through them to slide them together to adjust the hight.

[myxpykalix]

this needs to be adjusted "on the fly" and i'd rather use something that i can easily and incrementally adjust while the machine is runniing.

[phil_o]

A while ago I made a lathe/thickness sander. I built an adjustable table that attaches to the lathe bed and I mounted a wooden sanding drum between centers and fed the wood through on the adjustable table.
The adjustable table looked very much like your sketch. Between the two tables were opposing wedges controlled by a long bolt. Turning the bolt would raise or lower the table.
If I can find it I will post a picture but I haven't used it in a long time. I'm not sure if I know where it is.

[ron_varela]

Jack why not just make it a spring mount? it will support it and keep a slight pressure on it for odd shapes.
Ron


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[gerryv]

Would the rotational height remain more constant if the rollers were wide enough to always be in contact with 2 "crests"?

Maybe you could even put a stepper on it respond to changing diameters :-)

[jerry_stanek]

When I say a wedge this is what I'm talking about. You could use a carriage bolt and put a wing nut on the other end.


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[myxpykalix]

Ron,
The idea of spings is a good one. I'm glad (I) thought of it...lol

I think I might have it worked out in my head. I'm going to use one of those wood screws that has machine screws on the top half.
Screw that down into the base.
then use a T nut with a large round circumference disk with a nut epoxied in the center to screw it upward raising the whole assembly.
However the springs are a very good idea to stabilize all four corners.
I may be over engineering this thing but with all the good advice you want to incorporate all of it. Thanks Ron. I'm off to the hardaware store...

[myxpykalix]

Jerry,
AHHHH...now i understand. I thought it was something you just adjust by taking a mallet and tapping each wedge. I think by using T nuts on the outside edges of the wedges that would push/pull each wedge. Glad i saw that before i left for the hardware store. Thanks