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Questions & Answers
Saw cuts bevel at 0
Check that the bed of the saw (the flat metal part on the bottom) isn't bent. I've had this sort of thing happen on a jigsaw that needed to be tapped back into square. Check the squareness of the saw with a framing square or a carpenter's square held against the blade and the bed of the saw with the blade guard open. Obviously, make sure the saw is unplugged before doing this.
Blade stops when you start to saw
If the motor still runs you might have a problem as simple as a loose blade bolt, missing flange or worse a gear/armature problem, if the motor quits then you have an electrical problem that would need to be diagnosed, get back to me with either one and I will try and help further.
Motor arcing and smell of burning
you have a major electrical problem, unplug tool and remove the brushes to check their condition. Rotate the blade by hand and look for any unusual wear pattern or discoloration. This would indicate a failure and the appropriate parts would need to be replaced.
Hello i need to know : circular saw need to oiling
the gearcase for this saw is under the blade and you would have to remove the blade and the screws holding the gearcase cover in place. There is a small amount of GREASE in this cavity. If you want to replace the grease use a small amount of white lithium type grease. DO NOT pack this area full or you will cause more damage. Let me know if you need more assistance and if you give me the model and brand I will locate a breakdown for you so that you know what is involved.
I have a Makita circular saw that when you try to start it it barely turns and flips the breaker or tries to all the lights dim!!
Is there a start compacitor for that saw
All portable power tools including saws and most tradesman type saw benches use the light and powerful series wound brush-type motor that doesn't use a start capacitor.
The single phase induction motor that does use a start capacitor is far too bulky and heavy for portable tools but is found in many of the static workshop tools.
The powerful brush type motor is electrically very noisy and is almost permanently at the edge of self destructing. Good suppression to prevent radio and tv interference is necessary and this also helps protect the motor but a mains transient or power surge while in use can cause an internal surge destroying the insulation of the windings rendering the motor useless in a millisecond.
This could be what happened to your saw though it could equally be an internal short circuit in the power cord or inside the saw and these things must be checked before either writing off the tool or sending it for repair.
1/12/2021 3:13:28 PM •
on Jan 12, 2021
Model 2704. Why doesn't it turn on?
The principle of the series wound brush type motor is fairly straightforward with a field coil set either side of an armature that is mounted in bearings with a commutator and brush gear mounted at one end, the circuit consists of a field coil, the armature and the other field coil connected in series. The air gap between the rotor and stator is small but large enough to allow free rotation even when hot - electrically there should be continuity through the circuit from the start of one field coil to the end of the other though typically the dc resistance will be found to be low but will rise sharply when the armature is spun...
The checking of the wiring, switch and motor circuit is largely intuitive and well within the scope of the handyperson though the proper testing of electronic speed controls or soft starts is beyond most folk, fortunately though, these things are usually in the form of a module that either work or don't and if the remainder of the circuit tests ok it is reasonable to assume the module is defective and it is usually reasonable to bypass such a module to test motor operation before spending cash.
Professional equipment sold in many parts of the world must be fitted with an electric brake designed to stop rotation in one second when switched off - as yet I haven't had to delve into such things.
This design of motor is electrically very noisy and high powered motors are perpetually at the edge of self-destruction and effective suppression is important to prevent electrical interference to receiving equipment and to some extent protect the motor.
Suppression takes on a variety of forms from a through-module containing a variety of chokes and capacitors to discrete components. It isn't unusual for a suppressor module to fail - they often don't age well...
1/3/2021 6:47:34 PM •
on Jan 03, 2021
Makita table saw wont turn on
A failed power supply, broken on/off switch, bad motor overload, broken power cord or failed drive motor can prevent the table saw motor from starting. First, try resetting the overload. If the table saw motor won't start after resetting the overload, then the saw may not be getting power from the electrical outlet.
6/24/2020 10:57:41 AM •
on Jun 24, 2020
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