Thread: 55t press

250 PFC:


50mm plate. 400x400 and I oxy'd a 90mm hole in it to prep for bore and thread.


Same plate after lathe work. I had the outer area turned down to 40mm thick to reduce some weight. I just supplied the engineering shop with the plate and some drawings.


55t ram, 350mm stroke, single acting:

so maybe one of the engineering types can tell me if 250 PFC will be strong enough for a basic 55t H frame press. It will be 2 peices top and 2 peices for the table. 100x16 flat for the verticals, 2 each side with 200mm speration. Im thinking a 32mm dia hole/pin for the table height adjustments. I can box in the 250 PFC if needed. Frame width will be approx 840 clear between the 100x16 flat bar verticals

Where did you get the cylinder from Uninformed?

Cheers,

Tim

P.S. Nice Oxy work there! (If I had tried that the plate would be in 2 uneven pieces, and there would be small fires everywhere).

Hi Tim, I got it from Ebay USA, but had to have a guy over there buy and ship for me as the seller did not want to deal with outside USA. It is a SPX Power Team brand. When I first thought about a press I was using a mates. He has built all his own including the rams, pumps etc. I asked him for advice and he said that working on LR's he had maxed out his 30t a few times and had to use his 100t. So I looked for a 30t ram but could only find 20 and 50/55t ..... A good quality 50t H frame press wasnt cheap then either, but now you can get an ok Chinese type for about $1000. I have WAY more into mine than that. A $$$ leason, but atleast I get some experience making something. I really wanted to do the lathe work, but the only lathe I have access to that would swing the 50mm plate is 1000km away.

Edit: I forgot, I also bought the hand pump from the USA, also a SPX Power Team, but I got it from Ohio Power Tool. They were happy to ship to me. Pretty easy to deal with as well. I still get emails with there sales etc

Thanks on the Oxy, I dont get to use it as much as I like to (use = practice and practice = betterer )

#15 tip
acetylene at 100
oxy at 350

I used a compass guide. Drilled a 4mm hole on the circumference of the hole and used that as the starting point to get the heat into the cut area. I didnt get it hot enough first time....almost but not right. 2nd go was much better. Then I just let the plate stand and air cool as I didnt want to risk distortion etc by cooling with water.

I guess if you have the 16mm flat thats the answer but surely by the time you gusset and ladder the two "legs" of 16 a couple of heavy section beams or columns would be less work???

Perhaps Im not understanding your geometry?

Eitherway - Its sure gonna be noice! I love the 50mm plate
What does that weigh!!! Hernia material right there I would guess!

Will the hydraulic head have some coarse adjustment at the press head (think large suare form thread with a crank handle) such that you can preload parts before firing up the 55t hydraulics??? Top end big presses I have seen have this setup which makes them much easier to use

S

according to my maths, the 50mm plate now weighs 48.670kg....give or take. It felt about that when I lifted it off the tray of my truck.

regarding the uprights. Im basing my design on that of my mates, this also being a common commerical design. The reason for 2 seperate uprights each side, is to allow those odd long abjects that are bigger (wider) than the clear opening of the press. If they are smaller than the 200mm between the 2 100x16 uprights, then the object can be passed through them.

heavy section beams dont have the biggest top and bottom flanges. For example the 250PFC flanges are only 90mm wide and 15mm thick max, so would have to use atleast this size . Since you are basicly paying for weight with steel, its going to be cheaper to buy the flat bar anyway.

I have not seen what you describe regarding the adjuster for preloading?? not quite sure what you mean. The ram is fired up by my right arm I also have an air/hydraulic pump that may work for small work. Its the same brand and has quick connect fittings the same as the 55t ram and the hand pump....Ill have to check the specs.

I am considereing making the ram and mount movable left - right. I just have to sort a suitable design.