Pins for table support on a hydraulic shop press??

[MatBirch]

I'm building a 20 ton press for my shop, and have everything else pretty well handled. Wondering what might be useable and readily available for this application? I'm sure I could use grade 8 bolts, but finding them locally that have a long enough shank to clear everything is proving difficult. I do have access to a length of schedule 80 black pipe. I think that would be sufficient for a heck of a lot of force.
Thoughts??

 

[zkling]

Dimensions? A stick of solid round 4130 would be a good choice, all be it slightly overkill depending on the dimensions. Pretty easy to calculate the shear strength needed. Black pipe would not be a good choice. Again depending on dimensions, specifically diameter.

 

[Bondo]

I'm building a 20 ton press for my shop, and have everything else pretty well handled. Wondering what might be useable and readily available for this application? I'm sure I could use grade 8 bolts, but finding them locally that have a long enough shank to clear everything is proving difficult. I do have access to a length of schedule 80 black pipe. I think that would be sufficient for a heck of a lot of force.
Thoughts??

Ayuh,.... Are there any heavy duty Truck Shops in yer area,..??

Truck spring U-bolts are some tough stuff, in 'bout the sizes yer lookin' for,...

Any shop doin' much spring work, will have a dumpster full of 'em, as U-bolts are rarely reused,...

 

[A_Pmech]

Don't use pipe. It will collapse.

1" cold rolled round would probably be fine, that's what the Harbor Freight 20-ton presses use.

 

[454ragtop]

Might be able to get the shafts out of junk struts, lot of SUV's use struts now.

 

[larry_g]

The tractor store will have hitch pins. They are the right stuff.

lg
no neat sig line

 

[Farmall 1066]

Ditto for hitch pins. Made some out of some scrap shafting from an old combine once too.

 

[LXCam]

Like Pemch pointed out the tubing will deform and when it does, it won't be fun to get out.

Might be able to get the shafts out of junk struts, lot of SUV's use struts now.

And this wouldn't be my choice at all. Most of those shafts are harder then a honey moon Richard and will break under shear and when they do, you'll understand the term pink mist. Just saying

Hitch pins are good, but still soft and deformation may happen. I'd go with Zklings suggestion of the 4130 material. You could also go to Online metals and look up the best solution since you know the design and how big of a pin you can use. Not knowing how much meat you got makes it hard to suggest the right material.

Good luck

 

[MatBirch]

Hmmm... We keep u-bolts in stock, but they're only 5/8". I need the pins to be at least 6", but I'd be comfortable with 8". I can't recall seeing regular hitch pins that long, but I'll check with the ag shop.
As for "meat", I'm drilling the side legs of 4" channel. I've got room for a 1" hole, but wouldn't want to go bigger as I start getting my holes close to the edges. As the legs of channel taper, it is 1/4" thick near the edge, and a little over 3/8" near the web. My boss once told me while installing a lifting lug that 1/4" plate would support 90,000lbs if there was at least 1" of material from the edge of the hole to the edge of the lug. This would be tensile strength, as the load is resisting tearing a crane's hook through the lug. On my press, I have 6" between my holes, so that should never be a concern.

 

[LXCam]

What material (hot or cold rolled steel)will the pin be in and how thick also what size is C channel?. Assuming this is for the table and the upright, how much pay is there between the two widths, is it tight or do you have say 1/2" of play?.

 

[LXCam]

Here, maybe these will fit. Again just making some assumptions. Granted each pin is rated for the full shear your press can exert, you can reduce the diameter since the load is in theory evenly distributed, but I would suggest being at least towards the 75% margin and not go smaller then a 5/8" pin which is rated something like 30,000psi

http://www.mcmaster.com/#standard-quick-release-pins/=vtrt4o

 

[toplessHO]

axle shafts if you can find some that arent tapered for a ways up.

 

[MatBirch]

What material (hot or cold rolled steel)will the pin be in and how thick also what size is C channel?. Assuming this is for the table and the upright, how much pay is there between the two widths, is it tight or do you have say 1/2" of play?.

My channel is just basic channel. I guess it would be hot rolled. Tolerances of the table to the uprights... Haven't built the table yet. I plan to keep it as close as possible while still being able to slide it up and down freely.

 

[theknurl]

I had a KR Wilson 25 ton press it had 1" hot rolled pins.......look up the shearing force required to shear 4, 1" pins at the same time

my buddy JW had a 50 ton KR Wilson press, don't remember the pin size

though


KR Wilson built most of Henry Ford's tooling

 

[454ragtop]

Like Pemch pointed out the tubing will deform and when it does, it won't be fun to get out.





And this wouldn't be my choice at all. Most of those shafts are harder then a honey moon Richard and will break under shear and when they do, you'll understand the term pink mist. Just saying

Hitch pins are good, but still soft and deformation may happen. I'd go with Zklings suggestion of the 4130 material. You could also go to Online metals and look up the best solution since you know the design and how big of a pin you can use. Not knowing how much meat you got makes it hard to suggest the right material.

Good luck

You ever cut one? They're actually not that hard, although I think they are ground and chromed, which makes them very smooth and uniform. I have no problem turning them on the lathe, once you get through the chrome plating.
Jim

 

[LXCam]

You ever cut one? They're actually not that hard, although I think they are ground and chromed, which makes them very smooth and uniform. I have no problem turning them on the lathe, once you get through the chrome plating.
Jim

We're obviously talking about two different types. I have played around with what I had in mind.

 

[redmondjp]

Don't use pipe. It will collapse.

1" cold rolled round would probably be fine, that's what the Harbor Freight 20-ton presses use.

+1

1" cold-rolled round is exactly what I used when I built my 12-ton press in high school welding shop. Still working just fine.

 

[Ed ke6bnl]

Might be able to get the shafts out of junk struts, lot of SUV's use struts now.

thats what I use shocks offroad ones with large polished shaft and I leave the ends on them

 

[APEowner]

1" round 1018 steel is cheap and easy to come by. It should be in stock at any metal supply place. It's $10/ft at McMaster-Carr. It's more than strong enough for this application and in the unlikely event that you do overload it, it'll bend before it breaks to let you know you're doing something stupid.

 

[hotrod56]

Going back to the shop press thread - what diameter pin would you need for a 1.25" hole?

 

[Lwel9226]

Do you know anyone who works in a sawmill?? ....Preferably a millwright....
Ask them about chain pins for a "box chain"....
Very tough pins.... Should be able to find some with 3/4 or 7/8 dia....

LynnW

 

[homebuilt burner]

For reference: I have an OTC 17 1/2 ton press. It uses 2 pins on each side. But they are not that big maybe 5/8”.

 

[PugetDude]

Going back to the shop press thread - what diameter pin would you need for a 1.25" hole?

I'd look for 1-1/8" CRS or a 1-1-/8" Grade 8 Bolt