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Thread: Bandsaw wont stay on
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10th May 2021, 02:03 PM #1New Member
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Bandsaw wont stay on
Hi all
I have a bp-355 Hafco bandsaw and have for a bout 8 years, about 2 years ago it developed this problem where you push the (green) start button and as soon as you let it go it slow down and turns off (as if I had hit the red off button).. either way I bought a new switch thinking that must be the problem but didn't get to install it as had to place my tools into storage. (moving house getting a new shed built ) ).
Now about 6 months ago I moved my tools into the new shed, went to finally change over the switch but found it to be working normally (staying on) with the original switch.. Rippa !
until last weekend!!!
I changed the blade over to rip some 15+ big boards, hit the switch and the problems back. So I grabbed the new switch swapped it over but still the same issue... it just turns off the moment you let go of the green button.
any ideas what would cause that ??
The wife was not impressed standing out in the shed holding the green button while I ripped 15+ boards lol
Thank you
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10th May 2021, 02:05 PM #2
It could be a capacitor problem on the motor.
Worth getting it checked.
Tom.... some old things are lovely
Warm still with the life of forgotten men who made them ........................D.H. Lawrence
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10th May 2021, 02:10 PM #3.
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Does the saw uses a contactor? (A separate grey or white box in between the switch and the motor) if so the locking solenoid section of the contractor is damaged or broken
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10th May 2021, 03:13 PM #4New Member
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IT does have a capacitor, see image.. would a faulty capacitor still allow the unit to start up as normal and run full speed when the button is held ?
not sure about a contactor, the wires disappears into the main frame of the bandsaw, ill have a look and follow the wiring between the two
IMG_0939.jpg
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10th May 2021, 05:12 PM #5GOLD MEMBER
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When you push the GO button it applies power to the start capacitor and to the run winding. The motor runs. When you release the button the start capacitor is disconnected and the run winding, which is powered by the contactor, disconnects because the contactor is no longer powered. It gets its power from a contact on the contactor, which can be interupted by the stop button to stop the motor.
You have a fault in either the contact on the contactor or in the stop button. This may simply be dirt, or an insect, stopping the contacts connecting so I would recommend a good blowout of the contactor and stop button with compressed air, perferably with the covers off and power cord unpluged.
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10th May 2021, 05:19 PM #6New Member
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Ok don't know what this means exactly, but strangely if I remove the switch and just directly connect the terminals (IE now use the power point as the switch) it works fine.
so surely it has to be the switch that's faulty ? both of them ?
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10th May 2021, 05:23 PM #7GOLD MEMBER
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Try the blowout trick is this may be all that is required.
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10th May 2021, 05:24 PM #8New Member
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10th May 2021, 05:54 PM #9GOLD MEMBER
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10th May 2021, 07:56 PM #10
The switch has nothing to do with the capacitor on a modern saw. In the old days they used to start a big motor like that where you had to hold in the button till it got up to speed.
Could you put up a photo of the switch, particularly the connections on the back. Some need a small linking wire to maintain closed contacts, others have it internal. If it's one of those all in one switches which I'm guessing it is.Those were the droids I was looking for.
https://autoblastgates.com.au
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10th May 2021, 11:27 PM #11SENIOR MEMBER
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I have a bench grinder which sometimes won’t stay on unless you hold the button in, at other times it’s fine. The best theory I have is that it’s related to dodgy incoming power - I’m out on a farm with lots long longish low voltage cable runs, and the rural supply leave a bit to be desired too. They replaced a breaker recently and my grinder has behaved since then, so hopefully that’s the problem sorted out.
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11th May 2021, 10:38 AM #12
I have the same bandsaw and I've always had to hold the on button for a couple of seconds to get it running. If I just press the button quickly it will start to spin and then stop.
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13th May 2021, 07:24 PM #13
I have a similar problem.
Mine starts up fine but stops after about thirty seconds.
Holding the Go button doesn't do anything.
I guess it is the switch. I gave it all a good clean and blowout but no help.
A sparky is two weeks away.Scally
__________________________________________
The ark was built by an amateur
the titanic was built by professionals
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14th September 2021, 08:36 PM #14New Member
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Hey Darklink, any updates on this issue? I've just started having the same issue and Hafco rep said to replace the switch. I did this but no change. Cheers
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15th January 2022, 09:23 PM #15New Members
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I just bought this bandsaw brand new - assembled it, went to turn it on and it only runs when I hold the green button in.
So, I unscrewed the yellow shroud that goes around the on/off switch (with the big red stop button) and removed it. Low and behold - works perfectly.
The plastic cover was not letting the green start button be pressed the the full way, but now it’s working like a charm!
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