Blade jamming

UKworkshop.co.uk

Help Support UKworkshop.co.uk:

Jaco

Established Member
Joined
15 Dec 2002
Messages
448
Reaction score
5
Location
Gauteng RSA
I have a whole lot of templates (door stops, serviette holders) that I copied onto some scrap mahogany 20mm thick.
This is not the first time I have cut mahogany.

I used the big Hegner polycut on slow speed and a #12 blade.

Starts off ok, then starts binding, jamming, and rips the blade out of the holder. Remember: get the hands out the way!!!!

Clean the machine, check the oil nipples on the arms, polish up the table top, insert new #12

Stuck clear packaging tape on the back. Same story again. This is now becoming an expensive exercise.

Stop, pack mahogany away in the best interests of the safety of the machine.

The machine cuts ok with pine, as I cut 64 box joints in 20mm pine yesterday.

Any ideas why?
I have cut up to 50mm 3D beech reindeer without issues.
 

Kittyhawk

Established Member
Joined
30 Apr 2021
Messages
256
Reaction score
491
Location
New Zealand
No idea, sorry. But I sometimes have the same issue cutting Rimu which can be a bit resinous in parts.
I keep a wax candle handy and hold it against the running blade for a second or two and it solves the problem.
FWIW, in my old boatbuilding days we used a candle wax on brass screws to ease the resistance when driving them in, but to never use soap which does the same thing but is mildly corrosive.
 

Tony Works Wood

Established Member
Joined
29 Dec 2021
Messages
26
Reaction score
29
Location
UK
I have a whole lot of templates (door stops, serviette holders) that I copied onto some scrap mahogany 20mm thick.
This is not the first time I have cut mahogany.

I used the big Hegner polycut on slow speed and a #12 blade.

Starts off ok, then starts binding, jamming, and rips the blade out of the holder. Remember: get the hands out the way!!!!

Clean the machine, check the oil nipples on the arms, polish up the table top, insert new #12

Stuck clear packaging tape on the back. Same story again. This is now becoming an expensive exercise.

Stop, pack mahogany away in the best interests of the safety of the machine.

The machine cuts ok with pine, as I cut 64 box joints in 20mm pine yesterday.

Any ideas why?
I have cut up to 50mm 3D beech reindeer without issues.
Are you performing rip cuts? If so it could be tension being released when cutting through the timber causing the wood to close up and nip the blade. Drive a small wooden wedge or flat screwdriver into the saw cut behind the saw blade to prevent the timber from closing up and nipping/jamming the blade. Give this a try, let me know if it works. Tony
 
Top