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New starter for unisaw?

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Forum topic by ewell posted 09-03-2011 03:02 AM 1662 views 0 times favorited 7 replies Add to Favorites Watch
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ewell

10 posts in 1938 days


09-03-2011 03:02 AM

Found a steal on a unisawbut the guy said it needs a new starter? Havent been abl;e to find anything on the replacement part sites that is listed as a starter???? Its a 220v single phase 5hp. Anyone know the price range of such a part or if you even know what he is trying to tell me. The saw is 10 years old if that helps, and he is getting me the model number. Thanks. Ellis

-- Ewell, SC


7 replies so far

View ChunkyC's profile

ChunkyC

856 posts in 2716 days


#1 posted 09-03-2011 03:24 AM

Most switches aren’t rated for 5hp so that’s when a magnetic motor starter comes into play. It’s nothing more than very heavy duty relay. Try a search for motor starters and Google should return about 100M hits. I’m not sure how they do it on large Hp saws, but the starter may be part of the “On/Off” switch. Is the on/off switch big and honk’n. If so, then that’s more than likely what he is referring too.

c

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

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ChunkyC

856 posts in 2716 days


#2 posted 09-03-2011 03:30 AM

or

Maybe he was referring to the starting capacitor?

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

View ewell's profile

ewell

10 posts in 1938 days


#3 posted 09-03-2011 03:34 AM

Found info from another site saying that grainger could get an aftermarket starter for less than $50. Dont know about for a 5hp though. Anything under $150 and i am golden. Single phase 5hp for what would be $650? Cant go wrong there

-- Ewell, SC

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jusfine

2405 posts in 2388 days


#4 posted 09-03-2011 03:53 AM

Sounds like a steal, a switch will cost from $100-200. hope it is not more that needs work!

-- Randy "You are judged as much by the questions you ask as the answers you give..."

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Minorhero

372 posts in 2067 days


#5 posted 09-03-2011 04:37 AM

I usually buy my manual starter switches used off of ebay. If you want a magnetic starter expect to pay 150 to 300 dollars depending on how fancy you go. And even used I would be shocked if you could find a magnetic starter for less then a 100 including the switch.

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ewell

10 posts in 1938 days


#6 posted 09-03-2011 03:44 PM

Got a little verification from the seller now. He had an electrician look at it and he told him that he needed a new heater. The saw runs for a while the overheats and shuts off? Over heating saw needs a heater?? Doesnt sound right, but I will defer to the experts opinions. Any thoughts on the new info.

-- Ewell, SC

View Minorhero's profile

Minorhero

372 posts in 2067 days


#7 posted 09-03-2011 06:19 PM

Ok a heater is a part inside of the starter switch. It is not part of the motor at all. Basically the heater is designed to protect the motor from surges. If the wrong sized heater is installed (ie too small) for the motor or if a heater is damaged it will turn off after the motor runs for a while or when put under load. I had a lathe that I upgraded the motor on and had the same issue.

Heaters are usually pretty inexpensive and easy to replace. If it is a really old switch it could be hard to find the right heater, but if the saw is only 10 years old it should be relatively simple. Once you get the saw you can take apart the switch to find the right part number on the heater. The other alternative is to just buy a new switch.

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