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Tool Talk Discussion Forum

Home-made stroke sander blows fuses

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poor tom

01-18-2005 03:44:35




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I just built a large sander, known as a stroke sander, to sand wood and metal around here. It uses 12" forklift wheels on stub trailer axles to carry the sanding belt. Motor is a 5 hp. single phase, 21amp, 230V. Motor pulley is 3", and wheel pulley is 11". 1895 fpm belt speed. Wire from the panel to the machine is 8 gauge. When I turn on the power one pole/circuit blows its fuse. The machine still runs however! This surprises me. I guess its running on half power. Tried using 35 amp time delay fuses, but the same pole/circuit blew again....and the stupid machine keeps running like everything is just fine. I'm sure there is a huge spike in amperage upon start-up- the wheel assemblies weigh about 60lb. each. Should I use larger fuses? I have some 60 amp fuses left. I need to get it running on both poles before I can get an ammeter reading on it. I'm hoping it runs fine once it gets rolling. Maybe it is underpowered.....or needs a clutch to slowly engage the belt. Any advice is greatly appreciated.

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dr.sportster

01-18-2005 12:40:27




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 Re: Home-made stroke sander blows fuses in reply to poor tom, 01-18-2005 03:44:35  
MMMM,fuse blows and machine still runs that would be a call electrician.You aint explaining this by phone or computer.Sorry I am even laughing hystericly right now but shut that thing off it sounds dangerous.



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Bus Driver

01-18-2005 04:33:18




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 Re: Home-made stroke sander blows fuses in reply to poor tom, 01-18-2005 03:44:35  
Something is wrong with the wiring. The line on which the fuse blows might be connected to the equipment ground at the motor. Please get a pro to check it out- there are some critical safety issues involved.



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poor tom

01-18-2005 14:09:39




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 Re: Home-made stroke sander blows fuses in reply to Bus Driver, 01-18-2005 04:33:18  
Sorry to bother everybody. Found the problem. It was a short. Overtightened the box clamp. Stupid me, not machine. Machine runs better than expected. Plenty of power and tracks right on.



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dr.sportster

01-18-2005 18:02:28




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 Re: Home-made stroke sander blows fuses in reply to poor tom, 01-18-2005 14:09:39  
Hey great ,problem solved.I guess maybe eventually someone might have said check the squeeze connector.Sorry for laughing but it was a funny problem.



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