Damastang Posted January 16, 2015 Posted January 16, 2015 Pretty much as the title says. I am looking at building one but can't seem to find the same or even similar parts to the ones you guys use over in the US. And when I do find something here the price is an absolute joke. $900-$1300 for a basic 5hp motor...... and that's just the start. Don't even get me started on the price of hydraulics haha. Anyway, anyone done it? Cheers Quote
Steve Sells Posted January 16, 2015 Posted January 16, 2015 I am sure at least one has. If you would have spoken to us in the chat room ya may have found out who. edited to correct forum to chat room. Quote
Judson Yaggy Posted January 17, 2015 Posted January 17, 2015 Isn't he speaking to us in the forum now? I can't help you with sourcing stuff in Oz, but if you read some of the threads here like "It Followed Me Home" you can get a good sense of how to scrounge parts for cheap... Quote
knots Posted January 17, 2015 Posted January 17, 2015 My favorite place to find electric motors is at motor rebuild/repair shops. If you live in or near an industrial area of city there are usually motor repair shops with a variety of used motors for sale. Quote
bottles Posted January 17, 2015 Posted January 17, 2015 I think there is a picture of one made in "thawa forge" website. An h frame with a basic looking frame. Hydraulics in the UK are loads more expensive then us from what I can see. May be question of scale. Andrew Quote
Steve Sells Posted January 18, 2015 Posted January 18, 2015 edited to correct it.. He had popped in and out of the chat room, We had tried to talk to him, and there were 3 aussies in there, We figured posting in here he may have seen it and came back in. Quote
Damastang Posted January 18, 2015 Author Posted January 18, 2015 Strange maybe the chat room didn't load properly as there was no one in there on my end? Hence why I popped in then back out. Certainly didn't see any messages. Quote
Steve Sells Posted January 18, 2015 Posted January 18, 2015 figures many have been having issues with the forum and chat not loading . thanks I will add your name to the chat load list :( (I am on it also) Quote
forgemaster Posted January 19, 2015 Posted January 19, 2015 Damastang where abouts are you in Aus? Theres lots of mining and related users of Hydraulics here, the prices are pretty good. Give us an idea of where you are and we'll go from there. Quote
Damastang Posted January 21, 2015 Author Posted January 21, 2015 Sent you a PM forgemaster, check your inbox. Cheers Quote
forgemaster Posted January 22, 2015 Posted January 22, 2015 Have done, what did you want to know. When you are talking about a 5HP motor are we talking 240 or 415? What sort of hydraulic components are you looking for, pistons, valve banks, hoses, pipes, pump, fittings? Quote
Damastang Posted January 23, 2015 Author Posted January 23, 2015 240 volt singe phase 5hp motor at 3600 rpm, 5" bore 8" stroke 3000psi double acting cylinder, a 2 stage gear pump, probably 11/3 gpm or bigger. That's the guts of it anyway. Nothing is locked in , i am still learning a lot about hydraulics so any advice here would be appreciated. Still trying to work out if it is even possible in Australia first before I go looking into it any further. It's been on the back burner for a few years and now that my welding is well and truly up to scratch and I am in a workshop with all the good gear It is something I want to do. The press will be used for damascus but I only like to build things once so would rather go overkill then wish I had more squishing power. 25-30 tonnes is the aim with fast ram travel. Quote
Steve Sells Posted January 23, 2015 Posted January 23, 2015 20 is small for damascus billets, there is no head room for later that small, Just an fyi. Quote
Damastang Posted February 3, 2015 Author Posted February 3, 2015 I am really stuck with this. It seems you can't get a 3600 RPM motor on single phase power in AU. We have 240v AC 50hz, no idea why. 3 phase is out of the equation. How important is RPM? Could i use pulleys or a gearbox to increase the RPM of a slow 5hp motor? The ABS book doesn't go into much detail in that area, probably not a problem in the US as most motors seem to be 3600 RPM. Please if anyone knows anyone in AU who might be able to help me that would be greatly, greatly and greatly appreciated. Ok, finally starting to make sense of this now. Australia has 50hz power and you can't have a single pole motor (duh lol). Therefore in theory the motor would rotate twice the frequency of the supply so 50 hz = 50 cycles per second = 100 revolutions per second = 6000RPM but add in another pole and its 3000RPM. I can get a 4hp @ 2900RPM, 5hp @ 2900 RPM or a 7.hp @ 2900 RPM motor on single phase power, what are you thoughts? I am yet to run it through the hydraulic calculations to see what sort of flow rate i will get with certain size pumps. Hey, at least once this is solved it will serve as a resource for anyone else building a press. Quote
Judson Yaggy Posted February 4, 2015 Posted February 4, 2015 Max out the speed and hp that your electrical supply and wallet will allow. Quote
Damastang Posted February 4, 2015 Author Posted February 4, 2015 Yeah sounds like a plan. Does anyone know what formula to use to work out actual GPM based the rated flow of the pump and the motor speed and ultimately what my ram speed will be with any given pump turned at 2900 RPM? Also what's the maximum pressure I should be aiming for? Some people go 3000 PSI others go with 2500 PSI? keeping in mind that relief valve will be set a little lower than these pressures for safety reasons. Quote
turbo7 Posted February 4, 2015 Posted February 4, 2015 See if you can get hold of a variable speed drive or a variable frequency drive unit, should help with the extra rpm your looking for mate Quote
Damastang Posted February 4, 2015 Author Posted February 4, 2015 This is what i have worked out. If i buy a 16gpm pump (12.88 GPM @ 2900 RPM) which will require 4.65 hp so a 5 hp motor to make 24.5 tonnes with a 5" bore cylinder and a ram speed of 2.52 inches per second. If i buy a 22gpm Pump (17.79 GPM @ 2900 RPM) which will require 6.42 hp so a 7 hp motor to make 24.5 tonnes with a 5" bore cylinder and a ram speed of 3.48 inches per second. Is 2.52 inches per second going to be fast enough or will i need 3.48? Quote
Jeddly Posted February 4, 2015 Posted February 4, 2015 When I was doing my research on a press I wanted to build, I had the local hydraulics company work up the system. Using a 6" bore 3" rod cylinder, they were saying I needed a little over 5hp, 11gpm at fast advance, and 4gpm in press mode. Mind you, it was for 35 ton. I believe that gave me a speed of 1.5" per second. Quote
MOONY Posted February 15, 2016 Posted February 15, 2016 Hi damastang you can buy a 30? To n hydraulic log splinter for about 1400$ That will forge after you modify the blade with a set of die blocks Quote
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