I have a couple ideas - #1 don't use adaptive instead use straight slot milling. #2 just run the program again and see if a spring pass removes that remaining 0.005 to 0.010". Thoughts ?
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New vise jaw product
- Thread starter Janger
- Start date
I have a couple ideas - #1 don't use adaptive instead use straight slot milling. #2 just run the program again and see if a spring pass removes that remaining 0.005 to 0.010". Thoughts ?
- I agree with @RobinHood that deflection appears to be the issue and a larger EM would help or eliminate the problem (pardon my total lack of milling experience, but I don't know the meaning of "spring passes"). Keeping the EM as short as possible will also help.
- At the start of cutting down into the notch, the material below the EM is keeping the relatively short columns from defecting and any deflection is coming from the EM. But during the last few passes, the increasing height of the columns could cause the columns to deflect. Then both the EM and the column height are contributing to the total deflection (particularly if the columns were thinner or taller). I think this problem would be worse if you rough-cut the notch ID to say 0.980" and then did a full-height finish cut of 0.010" off of both columns.
- It appears that you are clamping the bottom of the part (pic in post 109) and you are milling in a N-S direction (y-axis). Consider rotating the part 90 degrees, lower it as low as possible in the vise and then mill E-W (x-axis) so that the vise jaws can (help) keep the columns from deflecting. Alternately, If you want to mill N-S (because of program, view, where you put your beer, or whatever) then rotate both the vise and the part 90 degrees so that you can lower the part in the vise.
Craig
- At the start of cutting down into the notch, the material below the EM is keeping the relatively short columns from defecting and any deflection is coming from the EM. But during the last few passes, the increasing height of the columns could cause the columns to deflect. Then both the EM and the column height are contributing to the total deflection (particularly if the columns were thinner or taller). I think this problem would be worse if you rough-cut the notch ID to say 0.980" and then did a full-height finish cut of 0.010" off of both columns.
- It appears that you are clamping the bottom of the part (pic in post 109) and you are milling in a N-S direction (y-axis). Consider rotating the part 90 degrees, lower it as low as possible in the vise and then mill E-W (x-axis) so that the vise jaws can (help) keep the columns from deflecting. Alternately, If you want to mill N-S (because of program, view, where you put your beer, or whatever) then rotate both the vise and the part 90 degrees so that you can lower the part in the vise.
Craig
I am studying machine design and would really like to take a look at the CAD files for this as it seems to hold some complex design strategies.
I looked at the link but for life of can't find where I can download them from.
Do you think you could send me a link or even the files themselves?
Thanks
Timely post @Janger . I watched a video the other night on a similar flexible design vise but it used a resovoir filled with small ball bearings. There is an air gap and as you close the vise the balls are shifted/squeezed to make room. Eventually all the space is full and the jaws cannot move.
Problem is I don’t remember where I watched it. Still looking. Cool concept
Problem is I don’t remember where I watched it. Still looking. Cool concept
Tom O
Ultra Member
Last edited:
Fantastic!
The video is more of a how to restore the vise and a lot less on how it actually works (humph). The ball bearing part makes sense - as you tighten the vise the space behind the jaws shrinks until it is all gone and the jaws tighten against the balls. The bar though passing under the jaw teeth is less clear what it is doing. I grabbed a couple screen captures - it appears to have a rectangular section cut out of the bar and the bar rotates I think to hit a flat on the teeth. I'm not certain though what it is doing. Is that a small lip on the bar? When you tighten the handle what is happening exactly? On the norgren I think the side handle clamps the fingers together. Not sure what is happening here.
The ball bearing flexible jaw vise is both ingenious and relatively simple. Or should I say simply amazing.
Sawzall can shaker - I cut off the bristle portion of a SS brush and attached that to an old sawsall blade. It works great for cleaning aluminum before welding.
Sawzall can shaker - I cut off the bristle portion of a SS brush and attached that to an old sawsall blade. It works great for cleaning aluminum before welding.
@Janger - In your post 109 above you had an issue with your vise speed wrench - here is my Version 2.0 of a speed wrench. The handle portion is a bit heavy so that when it is closed it is balanced. Version 1.0 didn’t work as well because it could conflict with the Y axis feed wheel. This one is more compact when closed. It spins quick & easily, has no conflicts, and when open it’s longer than a standard vise wrench.
Version 3.0 is coming soon (maybe). It will be made from aluminum and have an improved detent (out of the way the back) to hold it in both the open and closed positions.
Version 3.0 is coming soon (maybe). It will be made from aluminum and have an improved detent (out of the way the back) to hold it in both the open and closed positions.
Cool handle. I like the detent.
In a nutshell, it resets the jaws from their “adapted“ position to the fully extended, ”even” position. The cam underneath the jaws engages in the notch in the bottom of each jaw and the rotation of the cam, with the reset lever on the side, moves the jaws out.
The flat, milled out section on the cam is needed so that the jaws can slide back over the cam when the vice is tightened and the jaws “adapt“.
Edit: The sketch shows the max travel of a jaw. The steel balls may stop it before it reaches its rear limit, depending on the shape of the object being clamped.
Sorry for the ‘napkin CAD’… don’t have any computer CAD software.
Great post Rudy I think you've explained it well.
