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23rd August 2015, 11:56 AM #46
My experience is that windscreen washer pumps are designed for very short runs only. I have a pond pump on my band saw. Has been running for a couple of years. It has only had one cleanout when I changed to a new coolant. I have a relatively coarse filter (90mm rainwater seive) with a magnet in it, that the coolant runs across and another magnet in the bottom of the container. It work fine still.
Dean
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23rd August 2015, 12:13 PM #47SENIOR MEMBER
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Head height
Depending on where it will be situated head height is all important, although as it is listed at 3m that should be ample. It also doesn't say what type of pump it is: gear impeller, diaphram, wet, dry?
I prefer dry pumps now simply because when you want to service them you don't have to fish around in the bottom of the coolant container to find them and then spend time cleaning all the gunk off them.
Wish I had the same luck with pond type pumps as Oldneweng, unfortunately I went through a few on the bandsaw so now only use dry gear pumps where the rotor doesn't come in contact with fine swarf. On the lathe I use a standard dry impeller type pump. Whilst the magnetic rotor is, to a degree, open to swarf collection I've not had a problem. Not so when I used this type pump on the bandsaw, despite using a number of inline gauze, wire and magnetic filters the rotor still gummed up frequently and eventually stuffed the pump!
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23rd August 2015, 02:12 PM #48.
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Before hitting the "buy" button on eBay I decided to have one more look at the pump.
It was bastrard to get completely apart because the motor fan and the impeller were hard pressed onto knurled motor shaft ends but a bit of heat and pliers got them off
What I found was the rubber seal between the two body parts was not leaking.
What was leaking was rubber seal about 5mm thick around the shaft behind the impeller and this turned out to be was sloppy/worn.
The rubber seal was moulded into the plastic so could not be replaced but fortunately there was a groove in the inner bore of the seal and it was just big enough to tight fit a small Viton O-ring.
So I put one O-ring in the groove and one behind and one in front of the seal.
It's been running for 20 minutes - no leak. If it does eventually leak hopefully I can just replace the O-rings.
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