The Shop > Wood & Stuff
Drum/ Thickness Sander
micktoon:
Hi Simon, top marks for the sander and the video too, good editing and film work.Thanks for taking the time to record it all, it was a ig enough project to do without having to film it all too.
Cheers Mick
Bluechip:
--- Quote from: S. Heslop on March 16, 2015, 09:10:44 AM ---Thanks for the comments!
I forgot to add a thanks to Bluechip/ Dave in the video for helping out with the electronics. I added one to the video description.
There's probably some other people I aught to have thanked too but this project took so long my memory has gotten hazy.
--- End quote ---
All very nice to be publicly acknowledged, but where do I send the invoice ... :lol: :lol: :lol:
Now, about your sizzling MOSFET. What is driving it ?? ie Where does the 12V come from?
If it is not too well regulated, the voltage may well be dropping when the motor is driven on under load. If this happens the drive to the MOSFET could be insufficient to switch it in a sharp fashion and it will run warmer than necessary.
Scope the supply and see. :thumbup:
If it is, the quick and dirty way is to shove a diode in the supply to the '555 circuit ....
See attached:
If you do this the drive to the MOSFET gate should always be close to the full 12V and it will be driven on pretty damn quick, as the motor cannot drag the 12V to the '555 circuit down. C1 can only charge from the supply, it cannot discharge into the load, D1 prevents this.
This does assume that is the cause ... what MOSFET are you using anyway ??
Dave
PS C1 should be 220uF ... :palm:
Will_D:
Many thanks for an excellent thread and brill. video. :mmr:
millwright:
well done Simon,
I have followed and enjoyed the thread from the start. The icing on the cake must be the video and seeing it all come together. a great job.
:clap: :clap: :clap: :clap:
John
S. Heslop:
--- Quote from: Bluechip on March 16, 2015, 04:32:30 PM ---
--- Quote from: S. Heslop on March 16, 2015, 09:10:44 AM ---Thanks for the comments!
I forgot to add a thanks to Bluechip/ Dave in the video for helping out with the electronics. I added one to the video description.
There's probably some other people I aught to have thanked too but this project took so long my memory has gotten hazy.
--- End quote ---
All very nice to be publicly acknowledged, but where do I send the invoice ... :lol: :lol: :lol:
Now, about your sizzling MOSFET. What is driving it ?? ie Where does the 12V come from?
If it is not too well regulated, the voltage may well be dropping when the motor is driven on under load. If this happens the drive to the MOSFET could be insufficient to switch it in a sharp fashion and it will run warmer than necessary.
Scope the supply and see. :thumbup:
If it is, the quick and dirty way is to shove a diode in the supply to the '555 circuit ....
See attached:
If you do this the drive to the MOSFET gate should always be close to the full 12V and it will be driven on pretty damn quick, as the motor cannot drag the 12V to the '555 circuit down. C1 can only charge from the supply, it cannot discharge into the load, D1 prevents this.
This does assume that is the cause ... what MOSFET are you using anyway ??
Dave
PS C1 should be 220uF ... :palm:
--- End quote ---
That's a clever solution. Although to be honest i'm really sick of this project at this point. I'll save all this for when the thing fails. Thanks for it though.
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