What is this bolt called?

[crazychicken]

Anyone know what to call this thing that is a bolt with a sliding rod at the end to give you more torque?

http://www.oandgindustries.com/images/Grinding-Vice-Screw-type-.jpg

I want a 1/4"-20 version of that, but I can't figure out what to call it to search for it.

Thanks,

David

 

[Meghan54]

Seen them called a lead screw. Also have seen power screw and translation screw.

 

[lxskllr]

Allthread? You probably have to do some machining/modification to get exactly what you want unless you find a kit part ready made.

 

[crazychicken]

I just did some googling (for "1/4-20 lead screw" and "1/4-20 power screw" and "1/4-20 allthread") and found all kinds of threaded bars, but none of them had the sliding rod like on a vice where you slide it, turn it with a long lever arm for torque, then slide it and repeat - you know what I mean?

 

[Exodist]

Lead Screw is the proper term for what its being used for. Its not all thread, the thread on all thread is much smaller, the thread on this is ACME thread. Its used in Machining Vises like shown as well as lead screws on CNC and other equipment were part of the equipment needs to travel down a fixed trajectory or straight line.

 

[crazychicken]

Right, but still I need it to be attached to the little sliding rod so I can get a lot of torque when I twist it.

 

[Exodist]

Just throw you a small pipe on the handle then. I may not be grasping what your aiming at though. Forgive me if I am. I used to use much larger version of this vise in our CNC machines in my R&D lab. They are fun to clean out when powdered metal chips gets in the bearing on the fixed head of the vise. But anyway you can use 1/4-20 on it. Your thread on 1/4-20 would be .050 apart. Thus 20 threads per inch.. Not sure about 1/4 acme rod as 1/2 ACME is 10 Thread per Inch or 1/2-10 ACME.

 

[crazychicken]

Sorry if I am being unclear. I am trying to find this:

http://daviddoria.com/Uploads/screw.png

where the threaded part of it is 1/4-20.

 

[AnonymouseUser]

It's called a tommy bar.

 

[herm0016]

that is for a vice, it is not a bolt you will find, esp. in that small of a size. those acme thread rods are probably 3/4 dia. What you are making?

 

[AnonymouseUser]

Buy a 1/4-20 coupling nut and a short rod. Drill a hole in the coupling nut for the rod to fit.

 

[crazychicken]

AnonymouseUser - ok, that might be the best plan. I'll have to figure out what to use for the rod, and how to fatten up the ends once it is inserted through the hole in the coupling so it doesn't slide out. Any suggestions there?

 

[AnonymouseUser]

You could bend the ends in a bench vise, or thread it and put a hex nut on it.

 

[Colt45]

Use a wing nut if you want to do it by hand, otherwise use a wrench.

 

[Tsavo]

Use a wing nut if you want to do it by hand, otherwise use a wrench.

He could always use an usain bolt if he wants to do the job very quickly.

 

[AnonymouseUser]

Buy a 1/4-20 coupling nut and a short rod. Drill a hole in the coupling nut for the rod to fit.

AnonymouseUser - ok, that might be the best plan. I'll have to figure out what to use for the rod, and how to fatten up the ends once it is inserted through the hole in the coupling so it doesn't slide out. Any suggestions there?

This would cause the tommy bar to jam against the threaded rod, thus preventing movement and locking it in place. If you need the tommy bar to slide you'll need to use a set screw or solder the coupling on the bolt. Loctite may even work if you won't be tightening it too much.

 

[twinrider1]

For rod that small would a Female Ratchet Knob (part # 980) or a clamping knob do the trick? They're commonly available in 1/4" x 20 and I can't imagine needing more torque than I could get with one of these.

There are also balanced crank handles like you'd see on a mill, but that's getting pricey.

 

[Humpy]

Sliding T-handle Screw:

Bar Handle Screw

http://www.carrlane.com/catalog/ind...006280B1713050245221E0107070F1A3C3B2853524658

 

[Triumph]

look through here

http://www.reidsupply.com/products/tooling-components/

or here

http://www.reidsupply.com/products/clamps-workholding/