new vice mount on truck

[fdcmiami]

i had had a vice mounted on the passenger side of the truck i use for field work; ended up taking it off because i did not like going to the other side of the vehicle to do something. i wanted something on the drivers side that would not obscure the plate and would pull out far enough so that i could work and keep most of the grinding grit and slag off of the truck. most field units end up looking the same, sad, but you do what you can to delay that day.

the SS threaded rod is 1 3/8ths diameter, i had threads turned on it for another job. the plate is 1/2 inch mild steel that was left over from a repair i did recently. not much welding, i just stiched the top and bottom plates with some 6011 and welded the pin to the bottom plate with some 7018; that allows me to tighten up on the nut if need be. need a little paint touchup.

i have it pinned with a SS eyebolt. one point for when it's not in use the second at app 45 degrees.

i had another pin, aluminum and hardware so i built one on the back of the trailer. the pin on the trailer runs through three holes. it is very solid and i figure i will be able to mount any number of things to it. one plate has 9/16 ths holes the other has been drilled and tapped for four 1/2 13 SS bolts with the head of the bolt on the underside. this keeps the surface flat on the top so i can pivot (something?) busy work for sure.

on the aluminum mount, where the pins passes through on the bottom i will weld a SS washer to retain the pin when i tighten the nut above. probably do that today if i have time.

fabricated some bottle mounts for a small argon/co2, you can see one end of the bottle in one pic.


pics are out of order, sorry

[DaveO]

Smart idea- gives you a lot of flexibility while working on the truck, AND you can swap it over to the trailer when you need it.

Just out of curiosity- is this your design, or had you seen this elsewhere? I suspect people will want to copy it.

[fdcmiami]

Smart idea- gives you a lot of flexibility while working on the truck, AND you can swap it over to the trailer when you need it.

Just out of curiosity- is this your design, or had you seen this elsewhere? I suspect people will want to copy it.

dave, it is what i came up with rummaging through the parts bin but the design is too basic to have not been done by someone else. that round bar is 316 SS and i paid a lot of money to have 8 of them turned but only ended up using five. the 7/16ths ss acorn nuts on the vice are from a bridge job (railings and decorative metals, installation only) in florida that i had the labor contract on about 8 or 9 years ago. the speedway blvd bridge, in daytona beach. i still have about five hundred of them left and the at the current rate of usage they should be going to the heirs of my heirs. lol the flatbar was from a recent repair. because of that odd combination of materials it is not likely you will see another exactly like it but there will be others similar.

copy away,

[agent4573]

Even with super think material, with a moment arm that long, it seems like it will bend if you put something in the vice and start cranking on it. Did you think about adding any sort of vertical brace on the top of your mounting arm? I know you couldn't put anything under it because it wouldn't pivot back onto your bumper, but you should have room to put a 1 inch piece of something vertical most of the length on the top. It would really stiffen it up and let you do almost anything without fear of bending the mounting arm.

[fdcmiami]

Even with super think material, with a moment arm that long, it seems like it will bend if you put something in the vice and start cranking on it. Did you think about adding any sort of vertical brace on the top of your mounting arm? I know you couldn't put anything under it because it wouldn't pivot back onto your bumper, but you should have room to put a 1 inch piece of something vertical most of the length on the top. It would really stiffen it up and let you do almost anything without fear of bending the mounting arm.

i hear you but i don't think it will be necessary; that piece appears longer than it is; 23.5 inches. i can see where you might think that however if you picked up a piece of half inch thick by six inch wide by 24 inches long piece of steel flat bar you might have a different perspective. you did give me an idea when i went back and looked at it. i have a low profile machinists vice that is sitting on a shelf. i am going to put a matching bolt patttern in the flatbar so that i can put the milwaukee mag drill up there (74 lbs) and use it to drill when there's nothing else nearby to attach to.

[DVA]

i hear you but i don't think it will be necessary; that piece appears longer than it is; 23.5 inches. i can see where you might think that however if you picked up a piece of half inch thick by six inch wide by 24 inches long piece of steel flat bar you might have a different perspective. you did give me an idea when i went back and looked at it. i have a low profile machinists vice that is sitting on a shelf. i am going to put a matching bolt patttern in the flatbar so that i can put the milwaukee mag drill up there (74 lbs) and use it to drill when there's nothing else nearby to attach to.

With a 200 lb load on a 6x0.5 inch plate set up shown above would be about 0.35 inches. If two - two inch strips by one half of an inch were welded on the top of the beam, a 200 lb load would deflect the plate about 0.015 inch. This would be linear until the material reaches the yield point.

If the plate is A36 steel, the plate will start to plastically deform (bend) with a load of 428.5 lbs, providing a deflection of about 0.73 inches.

With stiffeners and assuming A36 steel, the plate would plastically deform at a load of 1850 lbs with a deflect about 0.15 inches. This would be a much more robust design, but if the load will not exceed 425 lbs the design looks to be sufficient for most vices, just not a good back up if hitting something with a sledge hammer.

[greygizmo]

Was the weight if the vise taken into account when coming up with the 425lb figure?

The bumper aside, simply stitch-weldng a 1x1 tube to the top I the plate would greatly improve the stiffness if the design. It doesn't just give you a higher yield strength, it gives you a higher stiffness throughout the plastic region. That means it will move less on you, and take more force to move it.

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