Drop Saw not braking anymore

[Midman]

Hi, just joined - been looking for answer for a couple of days. Should have guessed there would be something of this nature available. And I hope some one out there is familiar with the problem - which is:
I have always believed there to be a "blade-braking" system on these machines and of late it hasn't been happening - ie the blade is just winding down its own. I had a look at the exploded drawing of the LS1040 on the eReplacements.com site and cannot see anything that suggests a braking system which I would expect to be in relation to the cover guard mechanism.
Anyway there are considerable "grinding/growling" noises beginning to sound and I wonder if the last of a brake pad/shoe might be giving way.

Am I on the mark or way off beam? Either way can someone please point me to best options to consider.

Thanks in anticipation...

Midman

[qdea]

H i There,

the parts responsible for the eletric braking of the saw is the field and the switch,the field is comprised of 4 coils,2 of the coils are run coils,while 2 are of a thinner guag wire. what the thinner set of wires do is for a split second after the switch is released,before the switch goes to an open or off position,it sends power to this coil causing the armature to want to spin in the opposite direction,wherby creating a slow down or brake. sometimes this coil at the terminal or the part around the brushes,burn off or break. you can start by investigating this,and I'm sure you'll be able to solve the problem or just order a replacement field.

[Midman]

Thanks qdea,

If I didn't know better I'd say that was "dynamic braking". Began to wonder if that was a possibility when I thought about it after looking at the exploded drawing but didn't have any idea how they may have effected it. The description given to the "make-before-brake" contact arrangement to excite the "reversing" winding also sounds a bit like a "K" contact sometimes used in telephone relays of days gone by. So maybe there could be a problem there too do you think?

Anyway the "growling" noise eventually revealed itself as a slightly loose blade. Thankfully I caught that before the bolt came all the way out. I am in the middle of a production at the moment and so if I can keep it going and put up with it not slowing as well as I would like then I shall certainly try.

Thanks so much for your help - its nice to know there is nearly always someone out there that knows just a bit more than the average service man or is prepared to reveal.

Midman

[qdea]

YOu're very welcomed my friend,I'm happy to assist anytime I can..


Quincy