Quantcast
  • We invite you to join UKWorkshop.
    Members can turn off viewing Ads!

Help with repairing my table saw

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
I have a Scheppach HS105 table saw that I bought secondhand a few months ago. It seemed in good condition and until now has been working well. I used it to cut down a bit of studwork and I ended up braking the saw:

The blade clearly was blunt (it had been fine for the MDF that I have cut a lot recently but as soon as I tried to cut something more substantial, it was tough going). I should have replaced the blade but I didn’t have the spanner and nothing I had was thin enough to work (the guy I bought it off has since sent them to me) but thought it would be fine for 1 piece of studwork. Anyway, I was wrong and it wasn’t. It started smoking a little bit, then very big sparks came from the motor. I presumed that it simply needed new brushes (the old ones were chipped and clearly worn) so I ordered new ones. These came yesterday so I put them in, started it up and it sparked again and then cut out and wouldn’t start. I tried changing the fuse on the plug but no joy there.

Is there another fuse or have I broken the motor and if so, can it be repaired? If not, where would I buy a replacement? I have had a look for replacement motors but haven’t been able to find anything.

Any help would be appreciated.
 

RichardG

Established Member
Joined
29 Mar 2018
Messages
377
Reaction score
81
Location
South Norfolk
Can you see the commutator when you remove the brushes? If you can’t then I would remove the brushes and then split the motor so you can check and clean the commutator and check the bearings aren’t allowing the shaft to move. You can also then check that the brushes are sitting nicely on the commutator.
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
Can you see the commutator when you remove the brushes? If you can’t then I would remove the brushes and then split the motor so you can check and clean the commutator and check the bearings aren’t allowing the shaft to move. You can also then check that the brushes are sitting nicely on the commutator.
I’ll double check tomorrow to make sure but yes, I’m sure I could see the commutator when I removed the brushes.

I can understand why this would cause the sparking but would it stop it from turning on now? I don’t think there’s any power going to the motor. Is there a fuse I can check and if so, where? I have checked the one on the plug.
 

RichardG

Established Member
Joined
29 Mar 2018
Messages
377
Reaction score
81
Location
South Norfolk
I wouldn‘t try and power it up until you have found the reason for sparking, could be a segment is broken on commutator or a winding has fused, that would stop it starting. Have you tried spinning the motor by hand, does it turn ok? Do you have a multi-meter you could could try some continuity checks?
 

Sachakins

Is near enough good enough?
Joined
4 Apr 2020
Messages
244
Reaction score
142
Location
Liverpool
Is there a thermal breaker or thermal fuse on the motor.
Usually you will see a wire from the switch going into a small box and one coming out going to motor winding. If you can test for power into it and ok, but no power out then this thermal overload device is blown internally.
If your unsure about testing mains supply, with power disconnected you could just test for resistance across it.
 

gcusick

Established Member
Joined
16 Sep 2019
Messages
38
Reaction score
28
Location
Devon
Do you have the manual for the saw? If not, I can send you a copy.

There is (should be) an overload cutout, black button to the right of the on/off switch. Has that been triggered? Press it in to reset.

HTH
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
I wouldn‘t try and power it up until you have found the reason for sparking, could be a segment is broken on commutator or a winding has fused, that would stop it starting. Have you tried spinning the motor by hand, does it turn ok? Do you have a multi-meter you could could try some continuity checks?
I have checked and the commutator is clearly visible when I take the brushes out. I turned it on today and it started but turned itself off immediately again. The brushes weren’t seated correctly so I have tried to seat them better - basically they unseat themselves when I try to screw the cap on which then stops the spring working. As far as I can tell, they are now seated correctly (they are pushing against the commutator and when I rotate the blade, I can see the commutator moving and the brushes pushing against it). The blade moves freely but there is resistance against it, presumably that’s normal and the resistance is the motor turning?

I have tested the continuity for the motor and that is fine. The capacitor though is not showing a reading. It isn’t the easiest to make contact with the multi meter but I think I did. Is the capacitor likely to have broken?
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
Do you have the manual for the saw? If not, I can send you a copy.

There is (should be) an overload cutout, black button to the right of the on/off switch. Has that been triggered? Press it in to reset.

HTH
Yes, I have the manual but there isn’t anything in there that I can see which would help me. I have checked the overload button and that’s not the problem unfortunately.
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
I think it’s a shorted armature in the motor and will need to replace the motor. Any idea where I can get a new motor from, I have tried searching on the internet and can’t find anything.
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex

RichardG

Established Member
Joined
29 Mar 2018
Messages
377
Reaction score
81
Location
South Norfolk
Its worth splitting the motor, cleaning the commutator with some fine and then running a blade between each segment to ensure there’s no short between them, sometimes a bit of bush can short them out. Also a small bump on a segment can make the brushes jump causing the sparking.
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
Its worth splitting the motor, cleaning the commutator with some fine and then running a blade between each segment to ensure there’s no short between them, sometimes a bit of bush can short them out. Also a small bump on a segment can make the brushes jump causing the sparking.
Okay, I’ll give it a go. Worth a shot anyway and nothing to lose. Thanks
 

Boozer

Member
Joined
16 Apr 2018
Messages
6
Reaction score
2
Location
Stevenage
If no luck and you need any replacement parts you can contact Scheppach partner for UK.
info@nmauk.com
I was after part I broke for my hs105. I've attached parts drawing I got from Scheppach.
Pat
 

Attachments

DaveG

Member
Joined
7 Oct 2020
Messages
10
Reaction score
3
Location
Wales
I have a Scheppach HS105 table saw that I bought secondhand a few months ago. It seemed in good condition and until now has been working well. I used it to cut down a bit of studwork and I ended up braking the saw:

The blade clearly was blunt (it had been fine for the MDF that I have cut a lot recently but as soon as I tried to cut something more substantial, it was tough going). I should have replaced the blade but I didn’t have the spanner and nothing I had was thin enough to work (the guy I bought it off has since sent them to me) but thought it would be fine for 1 piece of studwork. Anyway, I was wrong and it wasn’t. It started smoking a little bit, then very big sparks came from the motor. I presumed that it simply needed new brushes (the old ones were chipped and clearly worn) so I ordered new ones. These came yesterday so I put them in, started it up and it sparked again and then cut out and wouldn’t start. I tried changing the fuse on the plug but no joy there.

Is there another fuse or have I broken the motor and if so, can it be repaired? If not, where would I buy a replacement? I have had a look for replacement motors but haven’t been able to find anything.

Any help would be appreciated.
I have a Scheppach TS2500. There is a built in safety cut out to protect the motor. The manual, which I downloaded free, says that you just have to wait for ‘as long as it takes’ to restart it. Mine took the best part of 24 hours and
then it restarted. The cut out is quite sensitive to even the slightest abuse of the motor.
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
So, I took the motor apart but it looked like new inside. I couldn’t see any evidence of shorting (I would expect to have seen a black patch) so I put it back together and tried again.

The blade turns freely but there was quite a lot of resistance on it. It turns on now and still sparks too much but not like before. Each time I run it, the blade frees up a little more so I am thinking that the brushes just need wearing in a bit. It does turn itself off most of the time and I’m mindful not to run it too much at once so I don’t overheat the motor whilst the brushes bed in.

Are there any bearings that could have got clogged up and need replacing which is putting extra load on?
 

Rugbyjack2005

Member
Joined
18 Jan 2021
Messages
12
Reaction score
1
Location
Essex
After running it for a bit, it’s still broken. The saw turns on but sparks excessively and the thermal cut out kicks in regularly as there is too much resistance on the motor.
 

clogs

just can't decide
Joined
24 Jul 2020
Messages
587
Reaction score
256
Location
Vamos, Crete, GREECE.......
if the motor drive belt is removed does the blade shaft spin freely....?

remember the blade is geared up from motor speed poss even double so that will feel like drag/stiffnes...
 
Top