Jet 16-32 Drum Sander

[murphy]

I have a Jet 16-32 Drum Sander and it has worked fine for years but lately it bogs down with slight pressure, I have always taken very light passes as I know it is not a thicknesser, but now all but the lightest pass and it stops mid way through the length, I have tried to see what is at fault but it is difficult to see, I have removed the drum and checked the large coupler which is tight on the motor shaft and the drum, both have a keyway which the grubscrew tightens down on so there is no slipage there, I wonder if the main motor is knackered, that is all I can think of, unless someone can suggest something else to try

 

[Fitzroy]

Are all the bearings ok, with pressure on the drum can you turn in by hand easily?

 

[murphy]

Thanks Fitzroy, yes I have checked the bearings and they are fine,

 

[guineafowl21]

It’s definitely the drum stalling, not the power feed belt?

Might be worth checking the cap(s) on the motor. My 22-44 version has a cap-start cap-run motor. If yours is the same, it might lack torque if the run cap has gone.

 

[murphy]

Thanks guineafowl, I have a friend who is an electrician and he is going to check it out for me

 

[murphy]

Where can I get a new Capacitor, does it need to be ordered from Toolfrance, the part no. is JWDS1632-154SC the motor is shown in the parts list but not the Capacitor, just the part number

 

[MorrisWoodman12]

Does the cap have the capacitance in microfarads (uF) and the voltage written upon it? If so you can buy it from any reputable electronic distributor eg. RS Components, Farnell/CPC, etc or you can get them through the long river or E buy gum! But the quality may be questionable.
Martin

 

[murphy]

Thanks Martin
I have emailed the Toolfrance outlet in Rugby UK to see if the have any in stock, as you said other brands might be cheaper but lower quality, I don't suppose a capacitor is very expensive anyway

 

[MorrisWoodman12]

Depends upon the capacitance. Can range from three or four squid upwards. Check that VAT is included with the sites I recommended.

 

[guineafowl21]

I’d be (pleasantly) surprised if the tool merchant would supply you with a new cap.

Did your electrician mate have a look? Caps are pretty easy to test. He’d probably have more luck ordering you a new one if needed. Otherwise, just post the details on here and we’ll find you one.

 

[murphy]

My friend is away until Monday, I am just checking to see how easy it was to get a capacitor, is it something I can check myself

 

[guineafowl21]

Unplug the machine and find the two caps under rounded covers on the motor. Assuming it has two, like mine does.

You can have a look - sometimes a failed one will have split and splurged its contents out.

A meter with capacitance test function is really needed. Discharge with an insulated screwdriver across the terminals, disconnect from motor and see if it matches the value written on there. Note the specs while you’re at it, and post here.

With a basic meter, you could try measuring resistance one way (should count up to overlimit), then swap leads (should go negative, count up past zero to overlimit again). Very basic test but would identify a dead short or open cap.

One quick test I forgot - turn the motor on briefly, then off. Listen for a click as it spins down. This tells you the centrifugal switch is at least partly working.

 

[murphy]

Thanks again guineafowl, this is the meter I have, I was a carpenter when I was working so have no idea about this electrical stuff, so I am not too sure if it has a capacitance test function or not, I have only one capacitor and have removed the cover, there is no visibile sign of anything wrong, I can take a photo of the writing on the capacitor if you want, also I can hear the click as it spins down
https://www.amazon.co.uk/Draper-Red...B0114IO6RE-&hvexpln=74&tag=googshopuk-21&link

 

[MorrisWoodman12]

I'm afraid that meter has no capacitance measurement capability. Guineafowl's technique of connecting the meter (on a resistance range) first one way and then the other is a very basic check. A photo of any writing on the capacitor will be useful.
Martin

 

[guineafowl21]

A single cap motor like that is unlikely to lose running torque from a failed cap - more likely, it just wouldn’t spin up. Let your sparky mate check it over.

If you’ve done obvious checks, like loose connections, and basic mechanical ones, you’re left with a strange fault.

Again, you’re absolutely sure it’s the drum stalling, not the power feed slipping? Sorry to patronise, but you haven’t confirmed that yet.

 

[murphy]

Thank you all for your help, sorry guineafowl, it is not the power feed slipping, My Mate the electrician can not come until after Christmas, and he is going to bring a new Capacitor with him just in case, attached is the reply from Toolfrance in Rugby UK, they obviously dont carry any stock, so I will not be getting it from them, do people actually pay £100 postage for a small item like this valued at £9.60 and wait 10-20 weeks for delivery?

 

[guineafowl21]

Thank you all for your help, sorry guineafowl, it is not the power feed slipping, My Mate the electrician can not come until after Christmas, and he is going to bring a new Capacitor with him just in case, attached is the reply from Toolfrance in Rugby UK, they obviously dont carry any stock, so I will not be getting it from them, do people actually pay £100 postage for a small item like this valued at £9.60 and wait 10-20 weeks for delivery?
View attachment 194754

That’s a good one! Candidate for Useless Quote of the Year*.

You could get a brand new TEC motor, on your doorstep in a few days, for less than that, or, fly to France and pick the part up for about the same.

You might be looking at a new motor - if the start circuit checks out, which it probably will, then we’re left with a defective run winding, unless we’re missing something silly.

Your sparky might check the loaded current draw against the rating plate, insulation resistance and do a visual inspection of the windings. Let us know the result, anyway.


*Note the start cap is quoted as 300 MFD (microfarad, μF, uF), which is useful to know.