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Press capacity for cranks

  • Thread starter Thread starter Urban spaceman
  • Start date Start date
U

Urban spaceman

Guest
Can anyone advice on a good capacity for a workshop press, it needs to be able to handle cranks.
I'm looking at 30 ton at the minute, does that sound about right?
Thanks
 
More than adequate. Last time I saw a pressure gauge used when pressing a single cylinder crank apart, it moved at around 3 ton.
 
Cheers Greg. I remember a friend telling me his 25 ton was at the limit taking a GS welded crank apart. But thats the only info i had to go on, hence i was aiming at a 30 ton.
 
i have seen(heard) 1" thick plates that the cranks hang on while being pressed a part break in half and make a god awe full explosion.
scared the hell out of me!:eek:
that may be your weak point on multi cylinder crank pressing.
i think this may have been a super crank in for repairs with really deep welds.
 
Welded cranks should always have as much of the weld ground out as possible before trying to press them apart....

FWIW hard experience says that anything above a 5 ton cold press interference fit risks splitting the crankweb.
 
blowerbike said:
i have seen(heard) 1" thick plates that the cranks hang on while being pressed a part break in half and make a god awe full explosion.
scared the hell out of me!:eek:
that may be your weak point on multi cylinder crank pressing.
i think this may have been a super crank in for repairs with really deep welds.
Click to expand...


That happened with my press, it was the ridicules 1" plate that was cast which came as a pair with the unit, absolutely naff, dangerous as hell and made me jump out'v my skin. Mild steel will is the way to go.
 
Sorry no link, but I've read some threads over at one of the Yamaha XS650 sites where guys have done their own cranks. A quick google search turns up lots of hits so you may want to search around. At any rate, one of the guys says he's using 50 tons because the rod throws can be a biotch.

I did some minor straightening on my GS1000 crank. It was kind of fun but doing a full crank seems pretty complicated. Please post some photos of the process. Would love to learn how you go about rebuilding a GS crank.
 
Thanks for the info folks, i too have read all the stuff - especially the XS650 stuff (seems like those folks have more crank issues than most!) on the net. I found some great step by step stuff for KZ cranks which are pretty similar ..... starts halfway down http://z1ownersclub.co.uk/forum/viewtopic.php?p=92838&sid=8ec783eabdae0aa16db5e944cb1f91a4 and there are some videos on youtube but most are for 2 stroke singles.
30 Ton sounds like it should do it then.
Next question, anyone have a nice press design thats just for bike stuff, i don't have room for and don't require a full size press. So something compact?
 
Get 50 TonPrincess auto. Mine has been working great for about 5 years Mike
 
Big Hammers!! Yup If you can a solid Huge Copper Head seems to work for me better than a Plastic dead blow type. Surprising the difference it makes. I imagine a solid Lead hammer would be nice also,..!! Mike
 
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