brushes: cutting trailing edge
#2
#3
Wouldn’t that make the brush offset to one-side?
Yes, you get a very short trailing edge but the inner diameter is all wrong. You will probably end up having to realign the brush hood otherwise it will take quite a long while before the brush sits completely on the armature..
Yes, you get a very short trailing edge but the inner diameter is all wrong. You will probably end up having to realign the brush hood otherwise it will take quite a long while before the brush sits completely on the armature..
#6
Tech Master
iTrader: (2)
The best setup I've found is an old item from S&K -- they are out of business, but many hobby shops, etc still have their stuff in stock. it was a simple rig that mounted an old stock motor to the base, then added an extension onto the shaft that allowed you to mount a fiber cutoff wheel (dremel style) onto the shaft. Also attached to the base was a vertical molded plastic piece that helped you hold the brush as you slid it up to the cutoff wheel. By adjusting the disk up/down, you could slot brushes or shave the trailing edge...
#7
Wouldn’t that make the brush offset to one-side?
Yes, you get a very short trailing edge but the inner diameter is all wrong. You will probably end up having to realign the brush hood otherwise it will take quite a long while before the brush sits completely on the armature..
Yes, you get a very short trailing edge but the inner diameter is all wrong. You will probably end up having to realign the brush hood otherwise it will take quite a long while before the brush sits completely on the armature..
#8
Tek Nickal - i was referring to the shape of the brush after cutting it on the brush cutter.
#9
Oh I see what you mean, but when you cut the trailing edge off you usually reduce the brush surface by about half. In your last illustration where you said to remove the colored area is exactly right, except you would probably remove more than just that. This is my interpretation of it.
#10
Good, we’re on the same page.
I’m doing that as well …
But always wonder… is that the right thing to do?
I’m doing that as well …
But always wonder… is that the right thing to do?
#11
The best way I've seen it done is to take a small file and shoe goo it to pretty much anything flat. A file that's about .060 thick works pretty well. Then simply lay the brush on the flat surface and slide it against the side of the file. Comes out perfect.
#12
Filing is really pretty easy, even by hand.
For best performance, cut the brush width to one half of the comm diameter.
It sounds really simple. What it does is allow the MOST brush wrap while NOT allowing any shorting accross any comm segment.
i have played with this a bit and found mixed results. But it seemed to add a little torque in high RPM motors, but overall power was a bit decreased. But still a tuning option.
Comms last longer though
For best performance, cut the brush width to one half of the comm diameter.
It sounds really simple. What it does is allow the MOST brush wrap while NOT allowing any shorting accross any comm segment.
i have played with this a bit and found mixed results. But it seemed to add a little torque in high RPM motors, but overall power was a bit decreased. But still a tuning option.
Comms last longer though
#13
Tech Elite
iTrader: (1)
also remember that taking off too much will have an effect on timing .. as do timed brushes ... butt if its just the trailing edge I usually use a Xacto blade and take off what i feel will work .. never had any problems doing this ... my motors run very good and dont loose any performance ..
#15