Hydraulic press support pin size and strength.

[knighty]

Here is a full view pic.

View attachment 377473

is your jack single or double acting / telescopic or whatever they call it

because it looks like it won't lift very high... which is a pain when you're using it and have to keep stopping to adjust things / add more pieces to give a longer stroke

 

[8ob]

The box section I have is rounded on the corners, and thinner wall. Virtually every press I've seen has channel supports or very deep, very heavy plate.

I used channel and 2" plate to spread the load. Works well.

Home made press

I made this hydraulic press about twenty years ago out of channel and a few second hand hydraulic bits lying about, its been in a storage container for a few years getting rusty and gathering dust so I am cleaning it up and painting it. It will fold 15mm thick plate @ 90 degrees, I dont know the...

www.mig-welding.co.uk

Bob

 

[ukracer]

here's a photo of my effort...
it's 25 ton Tangye and has just 25mm black round bar...plenty of times the jack has gone overload relief.....
sorry about the mess........hahaha
View attachment 377421

What mess??

 

[Pete.]

Series LandRover halfshafts here.

View attachment 377471

Those can't be landrover, the ends aren't twisted off

 

[Bornfree]

Can’t overbuild a press!!

True but I came close

here's my home made one.View attachment 292897

 

[Screwdriver]

The box section I have is rounded on the corners, and thinner wall. Virtually every press I've seen has channel supports or very deep, very heavy plate.

Understood but if you are going to MODIFY a channel section, that looks like the worst case scenario. Look at where the forces you’re trying to resist are going to end up. Pivoting along a weld join….

 

[striker]

Understood but if you are going to MODIFY a channel section, that looks like the worst case scenario. Look at where the forces you’re trying to resist are going to end up. Pivoting along a weld join….

All the 20 ton presses I've looked at use 4" channel, not as heavy as I'm using and un braced. I'm using heavier channel and bracing it with plate as I have some, and, as I've said, I tend to over engineer things.

 

[ukracer]

All the 20 ton presses I've looked at use 4" channel, not as heavy as I'm using and un braced. I'm using heavier channel and bracing it with plate as I have some, and, as I've said, I tend to over engineer things.

I have had the steel for 3 years to build a large press but no longer get the time.
One thing that stopped me was time to drill the holes on the Web for the pins to adjust the height. But now I have access to a mag drill I might sort that easier.

 

[highseas]

I used channel and 2" plate to spread the load. Works well.

Home made press

I made this hydraulic press about twenty years ago out of channel and a few second hand hydraulic bits lying about, its been in a storage container for a few years getting rusty and gathering dust so I am cleaning it up and painting it. It will fold 15mm thick plate @ 90 degrees, I dont know the...

www.mig-welding.co.uk

Bob

Bob that video still makes me feel all fuzzy I must get round to making one!

 

[Rrobson]

You can make them almost entirely out of channel, mines a 25t constructed from 6” channel

 

[striker]

I've noticed, on the verticals, some have the web inside and some outside...

 

[ukracer]

I've noticed, on the verticals, some have the web inside and some outside...

Is that an RSJ?

 

[Screwdriver]

All the 20 ton presses I've looked at use 4" channel, not as heavy as I'm using and un braced. I'm using heavier channel and bracing it with plate as I have some, and, as I've said, I tend to over engineer things.

Appreciate that and I assume a suitably specced channel would be sufficient on its own. Depending on the design and fixing, I merely suggest that sort of bracing could conceivably make things worse.

I am not making any criticism of anyone’s work here, just looking at a pic of a bracket with a brace that doesn’t look right to me.

 

[striker]

Appreciate that and I assume a suitably specced channel would be sufficient on its own. Depending on the design and fixing, I merely suggest that sort of bracing could conceivably make things worse.

I am not making any criticism of anyone’s work here, just looking at a pic of a bracket with a brace that doesn’t look right to me.

I can see your point. Maybe the brace could introduce a twisting force if at an angle. I will consider placing it vertically to effectively make it a box section, something to think about!

 

[not done it yet]

Just been out to check my Sealy 15T press and it has 19mm pins and they are still dead straight after many years...hope this helps

But are they mild steel? Do you use your press at maximum all the time? Is the press in continuous use? Can one guarantee that the load will be spread across all four pins evenly? If it is home-made, perhaps more metal is a better choice over a computerised design with minimum overload capacity.

Basically, I don’t know, but would make sure, before going ahead with a possibly flawed design.

 

[Pete.]

I've noticed, on the verticals, some have the web inside and some outside...

If I were building it, inside every time. Not everything you press will be a regular shape and it's nice to have a face to block the part off to stop it flying.

 

[Memmeddu]

60mm pins on the 100 ton press at work
They are case hardened ...
Roughly 25mm on the 20 ton
And 45mm on the 50 ton

 

[striker]

60mm pins on the 100 ton press at work
They are case hardened ...
Roughly 25mm on the 20 ton
And 45mm on the 50 ton

Thanks good info!

 

[nickk]

As a guide,black mild steel bar is 28 imperial tons/square inch.

 

[Screwdriver]

I have a few hardened pins I picked up for similar purposes. Might be persuaded to part with some to help a project.