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24th September 2015, 08:13 AM #1
Thicknesser Troubles - Spiral head
Hi WWF,
I have just finished installing a CTS spiral head in my Carbatec 20" thickie.
Unfortunately the unit now trips the power on startup. The trip occurs about 4 secs after startup and just before it reaches max RPM. Everything sounds perfect so i am assuming I have put it all back together right.
The machine is running on a 10A circuit protected by a 16A c/b.
The machine has run perfectly with the traditional blades for 6 weeks now. I do however need to delay the startup of my dust extractor otherwise the simultaneous startup current of both machines also trips the power.
I have one theory here however I am interested to hear ideas (that have not been influenced by my guess) from WWF before I share.
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24th September 2015 08:13 AM # ADSGoogle Adsense Advertisement
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24th September 2015, 08:31 AM #2I now have 3 sheds
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Hi Damienol
A quick stab in the dark...... is the new head heavier than the one you replaced?
You may need to modify your power supply to 15amp circuit unless you can install a higher rated circuit breaker in your existing shared 10amp circuit.
Regards
Twosheds
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24th September 2015, 08:38 AM #3
Ok, so the supply line is meant to be on a 15a circuit but let's ignore that for now.
One thing to check for, is that you haven't somehow nicked any of the wires going to the run Capacitor cause that kicks in just as it gets to full rpmCheers
DJ
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24th September 2015, 08:47 AM #4SENIOR MEMBER
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Is there too much tension on the belt between the motor and the drum ?
RoyGManufacturer of the Finest Quality Off-Cuts.
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24th September 2015, 08:52 AM #5
Could the bearings have cold grease in them creating drag on the whole assembly?
Why I ask is because I gave my old Jeffwood Thicknesser a "birthday" and pumped in new grease from a new grease gun I had just bought and wanted to try out. With cold weather it takes ever sooooo long to get up to operating speed. Remedy for me, was to disassemble, wash out the grease and repack with less quantityJust do it!
Kind regards Rod
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24th September 2015, 10:04 AM #6Woodworking mechanic
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If the circuit breaker is the design that has the additional bi metallic strip trigger for prolonged current triggering rather than the singular instantaneous high current tripping type, then if the drum was taking longer to reach its maximum rpm, it could be causing it to trigger (hence the 4 sec time). This is due to the dynamic resistance of the motor rising more slowly.
You stated that the circuit was on the edge anyway ie. Extractor and thickly tripped breaker if turned on simultaneously.
Heavier drum, tighter bearings, higher resistance to turning (air resistance?) could all play a roll presuming nothing went haywire on drum replacement
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24th September 2015, 10:08 AM #7
I would expect that the spiral head would be heaver doe both to the profile of the head and weight of the carbide. However, I still would not expect it to trip a 16A breaker. Maybe a faulty motor cap or faulty breaker and the marginal increase in weight has tipped it over the edge. Also note that the start up current on a motor is much higher than the run current until the start cap is taken out of circuit by the centrifugal switch.
Dare I say, use a 20A breaker? (Pause for storm...)
John
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24th September 2015, 04:02 PM #8
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24th September 2015, 04:04 PM #9
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24th September 2015, 04:48 PM #10GOLD MEMBER
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I would check to see if the head spins freely without the motor/belt/feed rollers connected. probably a misaligned or overclamped bearing restricting rotation.
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24th September 2015, 09:07 PM #11
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24th September 2015, 09:08 PM #12
Bearings are brand new
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24th September 2015, 09:10 PM #13
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24th September 2015, 09:13 PM #14
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24th September 2015, 11:03 PM #15SENIOR MEMBER
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The sparky in me cringes. I have been off the tools for over 15 years now, but reading this type of comment makes me nervous. Its not all about the breaker. Please make sure the wiring is suitable, and the demand on that circuit will not exceed what the wiring is capable of.
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