- Joined
- Jun 11, 2006
- Messages
- 8,651
So long story short my press budget is being spent (hopefully) on a knee mill. Thy are auctioning off a Kalamazoo knee mill at my work. It's been sitting out under the shed for a year or so and I have wanted since day one. Any way on to the topic at hand. Press budget is gone so I'm having to be creative as I'm still moving forward. I was able to source all the steel I need for the body so I got that part taken care of. I was also able to acquire a hydraulic cylinder. The hitch is I don't know the size of the bore. It has a 5" OD and is 40" long with a 2" ram. It was a tilt cylinder from a forklift. Seams rather beefy but I'm wondering what kind of pressure it can take. Is there a way to find this information on a mistery cylinder?
Also Motors, oh motors where do I start. My plan was to use my 10HP 3ph with a VFD. I was all set to buy it and then found a bad review for it and had second thoughts. The next day the mill was posted for auction so no VFD. I looked in my motor pile and the only other option is a 3hp 34xxRPM motor. It needs new bearings as it sounds a little gritty. So I went back to the ten horse and started doing some research. I guess according to people smarter then I that you can in fact run 3ph motors on single phase. It requires one of 3 things. 1: Rotary phase converter. 2: Capactor start known as a static phase converter. 3: Rip cord. Really a rip cord, so I tryied it out. Wired up the motor to 220 and wrapped para cord around the shaft and pulled. Once the motor was spinning I flipped the breaker and hot dam the motor fired right up. Ran smooth and quite. But thy say becaus your only running 2 winds and not the 3rd you are at 2/3rd power. So that puts me at 6.66 HP. Then I started wondering about the 20HP motor I have. Do I use it as a rotary phase converter or do I run it like I did the 10HP at 2/3rd power. That puts me over 13hp. The motor needs bearings I think as it's difacult to turn. I'm planning on taking it apart and seeing if it's bearing, cleaning or any number of things. The winds measure of so I hope it's an easy fix.
So that's what I have right now. I know I will have to buy a pump and hoses as well as control valves. But using what I have on hand right now what do you think is the best way to go. When I get the money I will replace the budget parts with other parts down the road. I know with the motor issue you cant start these motors with a load. Is there a way to run a bypass on the pump so I can reduce the load while starting the motor. If I go with the 10hp at 6.66HP out put should I use a two stage press or stick to single stage. If the cylinder was 4" that gives me 19 tons at 1" sec. if I use the 20HP with 13.33HP output that's 10 tons at 2" a sec. if I luck out and the bore is larger like 4.5"(don't know how, that's 1/4" wall) then the numbers get impressive. 13hp @ 3000psi is 24 tons at 1.66" sec. just got fun I ran the numbers on a 6" cylinder and it's like 42 tons at 1" sec.
Any way I'm just looking for advise on how to proceed with this build on the minimum budget I have left. I mean I could loose the silent auction and be back to square one but I'm hoping I get it.
Thanks guys for any help you can provide.
Also Motors, oh motors where do I start. My plan was to use my 10HP 3ph with a VFD. I was all set to buy it and then found a bad review for it and had second thoughts. The next day the mill was posted for auction so no VFD. I looked in my motor pile and the only other option is a 3hp 34xxRPM motor. It needs new bearings as it sounds a little gritty. So I went back to the ten horse and started doing some research. I guess according to people smarter then I that you can in fact run 3ph motors on single phase. It requires one of 3 things. 1: Rotary phase converter. 2: Capactor start known as a static phase converter. 3: Rip cord. Really a rip cord, so I tryied it out. Wired up the motor to 220 and wrapped para cord around the shaft and pulled. Once the motor was spinning I flipped the breaker and hot dam the motor fired right up. Ran smooth and quite. But thy say becaus your only running 2 winds and not the 3rd you are at 2/3rd power. So that puts me at 6.66 HP. Then I started wondering about the 20HP motor I have. Do I use it as a rotary phase converter or do I run it like I did the 10HP at 2/3rd power. That puts me over 13hp. The motor needs bearings I think as it's difacult to turn. I'm planning on taking it apart and seeing if it's bearing, cleaning or any number of things. The winds measure of so I hope it's an easy fix.
So that's what I have right now. I know I will have to buy a pump and hoses as well as control valves. But using what I have on hand right now what do you think is the best way to go. When I get the money I will replace the budget parts with other parts down the road. I know with the motor issue you cant start these motors with a load. Is there a way to run a bypass on the pump so I can reduce the load while starting the motor. If I go with the 10hp at 6.66HP out put should I use a two stage press or stick to single stage. If the cylinder was 4" that gives me 19 tons at 1" sec. if I use the 20HP with 13.33HP output that's 10 tons at 2" a sec. if I luck out and the bore is larger like 4.5"(don't know how, that's 1/4" wall) then the numbers get impressive. 13hp @ 3000psi is 24 tons at 1.66" sec. just got fun I ran the numbers on a 6" cylinder and it's like 42 tons at 1" sec.
Any way I'm just looking for advise on how to proceed with this build on the minimum budget I have left. I mean I could loose the silent auction and be back to square one but I'm hoping I get it.
Thanks guys for any help you can provide.