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Thread: Eccentric
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24th November 2008, 07:55 PM #1
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Eccentric
I have been looking for a quick and easy way to hold down the work piece on a cutting sled. I decided to have a try at eccentric wheels as a holding option. I dare say I am not the first to try this but it works. I used MDF to make 3'' wheels on the lathe but this could also be done with a jig on the bandsaw. The hardwood pins are 1'' dia. I was going to drill the rims to take a leaver to tighten them but it is nut necessary. The MDF seems to grip the wood well. With the 3'' wheel you get almost 1'' of travel. I may try larger ones for different thickness of timbers. The pictures tell the story.
Regards
John
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24th November 2008, 08:30 PM #2
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Good one John, That's got me thinking about a whole heap of othe eccentricities - could be a few uses eh?
I wonder if anyone can come up with something as usefull as your jig though?
Denn
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24th November 2008, 08:34 PM #3
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The way to handle thicker timbers would be to install a T-track. Attach short arms to the track and put the cams on the other end of the arms. But, a T-track and a simple clamp board will handle all this and more without the cams.
Also watch out how you lock the board. Ideally you should lock one cam one way and one the other. If not, and the board is slightly sloped the vibration can move the board sideways - not a good thing on a TS.
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26th November 2008, 12:11 PM #4
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Thanks for the replies.
I got the idea from hatch locking dogs as found on some ships. I also remember seeing eccentric wheel dogs on a plan for a workkbench. I am sure they could be used for all sorts of applications.
I did figure out that they have to be locked opposite to each other. I was impressed by how well they do hold. I think it has to do with the MDF being softer than the wood. While T track and hold downs would be nice this sled has cost me nothing but my time.
Regards
John
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26th November 2008, 01:08 PM #5
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26th November 2008, 04:40 PM #6
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John
The principle behind eccentric cams is they work best when, in the lockdown position, they are over centre. I use them quite bit and I'll try to find time to photograph a couple of examples. Most of mine are made on the bandsaw and incorporate a handle to make life easier and allows for increased pressure.
JerryEvery person takes the limit of their own vision for the limits of the world.
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