The Shop > Wood & Stuff
Drum/ Thickness Sander
S. Heslop:
--- Quote from: Fergus OMore on January 30, 2015, 11:01:08 AM ---Simon
Probably your supplier at a reasonably approachable price is Wickes. I bought a long roll- about 12 metres long but only 10cm wide. It's about £12 a roll. How to join it is any bodies guess. All that I can tell you is that I bought stuff for an old Picador but it was only about 3" wide. The firm was Davis Abrasives then in Byker and is now in Cramlington. The joints were diagonally cut and scarfed and glued.
Maybe this helps. Let me know
Norman
--- End quote ---
Hopefully this sanding belt is going to work fine, but i'll keep that in mind if it doesn't.
S. Heslop:
Sanded more of a crown into the rollers (measures about 1mm wider diameter in the middle) and it seems to be tracking now. Although there's a strange squeaking/ knocking sound coming from the roller itself that I can't identify. My best guess is that it's the belt sort of slipping in parts due to the wider diameter in the middle.
S. Heslop:
Went and bought some electric stuff today to build a PWM speed controller for a car windscreen wiper motor. I could've just bought a controller from ebay but i've been wanting to learn some electronics for a while, and this gives me an excuse.
It took a few tries to get something working. Keep in mind I really don't know alot about electronics besides the basics. I was first going with some more complicated diagrams i'd found online, specifically for PWM speed controllers, and I must've been mucking up the wiring somehow. So eventually I looked up some 555 timer stuff and found a very simple diagram that I was able to successfully build.
It's not without problems though. At about 75% duty cycle the wavelength of the signal starts to increase. I probably need to read up on 555 timers and play around with them more.
Glad I bought the oscilloscope though! I would've really been lost without it.
Bluechip:
I presume your pot. is linear, not log or semi-log ???
Which is my usual antic .... :loco:
Dave
S. Heslop:
Yeah, it's linear. I got some 47k and 100k ones. I was considering getting some log ones too but ended up being in a hurry making the shopping list and forgot to ask in the shop.
What difference would logarithmic pots make? Just give me an easier time fine adjusting the small range where the pot actually changes the motor speed?
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