Speed control help needed for home build
01-25-2010, 04:15 AM
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Speed control help needed for home build
G`day guys
I recieved a couple of new bits today, a 1/4 scale steering servo and another servo.
Well its got me all fired up to try and get the landy sorted and running.
Since it wont be high speed or off road i figure by putting some bearing type thrust washers on the king pins the 1/4 scale servo should do fine for the steering, but what i need is some help with the drive.
I have always thought of using a cordless drill as the motor for it but i dont know enough about these things to know what to do about a speed controller with forward and reverse.
I can build the metal bits just fine but the electrical and specialist RC bits are outside of my experience range till now.
So can you guys offer some thoughts on my options, can i buy one? Can i make one? can i modify something that will do the trick?
I have several different cordless drills in the shed that can be used for this, with various voltages up to 24v. Is there a way to isolate the radio batteries from the cordless battery and still have speed/forward reverse control?
Its got a live axle in it with a Grinder head modified for a right angle drive so its got a shaft input at the moment, thats why i thought of using a cordless, i could just put the drive shaft in the chuck.
I had a cordless hooked up to test it out and it drove it fine but it was just a set speed no start or stop etc.
Bumper to towball its 1200mm long, wheelbase of 665mm and a track of 500mm. Not sure on exact weight but i`d guess about 8 - 10 kilo`s
Cheers guys
Troppo
I recieved a couple of new bits today, a 1/4 scale steering servo and another servo.
Well its got me all fired up to try and get the landy sorted and running.
Since it wont be high speed or off road i figure by putting some bearing type thrust washers on the king pins the 1/4 scale servo should do fine for the steering, but what i need is some help with the drive.
I have always thought of using a cordless drill as the motor for it but i dont know enough about these things to know what to do about a speed controller with forward and reverse.
I can build the metal bits just fine but the electrical and specialist RC bits are outside of my experience range till now.
So can you guys offer some thoughts on my options, can i buy one? Can i make one? can i modify something that will do the trick?
I have several different cordless drills in the shed that can be used for this, with various voltages up to 24v. Is there a way to isolate the radio batteries from the cordless battery and still have speed/forward reverse control?
Its got a live axle in it with a Grinder head modified for a right angle drive so its got a shaft input at the moment, thats why i thought of using a cordless, i could just put the drive shaft in the chuck.
I had a cordless hooked up to test it out and it drove it fine but it was just a set speed no start or stop etc.
Bumper to towball its 1200mm long, wheelbase of 665mm and a track of 500mm. Not sure on exact weight but i`d guess about 8 - 10 kilo`s
Cheers guys
Troppo
01-25-2010, 05:12 AM
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RE: Speed control help needed for home build
Does the drill you're looking at using have variable speed trigger?
If so you should be able to do it mechanically using a servo I reckon.
Might have to disassemble the trigger on the drill (Probably a good idea to ahve a backup just in case
) and figure out what does what, and then hook it up to a servo.
The servo would then do the same job as your finger pushing the trigger on the drilll.
The trigger should have a spring inside it making them return to the "OFF" position when you let go with your finger.
I reckon you could get that spring out, and with some linkages and shed ingenuity make a servo allow you to have variable speed control.
For reverse you could have a second servo set up to (also mechanically) flick the "FWD/REV" switch on the drill.
Depends on how tricky you wanna get of course.
If so you should be able to do it mechanically using a servo I reckon.
Might have to disassemble the trigger on the drill (Probably a good idea to ahve a backup just in case
) and figure out what does what, and then hook it up to a servo.The servo would then do the same job as your finger pushing the trigger on the drilll.
The trigger should have a spring inside it making them return to the "OFF" position when you let go with your finger.
I reckon you could get that spring out, and with some linkages and shed ingenuity make a servo allow you to have variable speed control.
For reverse you could have a second servo set up to (also mechanically) flick the "FWD/REV" switch on the drill.
Depends on how tricky you wanna get of course.
01-25-2010, 05:24 AM
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RE: Speed control help needed for home build
i think Jaycar have a 12 volt motor speed controller kit.... controlled by a knob which i would guess you would hook a servo arm up to....
01-25-2010, 05:32 AM
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RE: Speed control help needed for home build
ORIGINAL: Dirty_Vinylpusher
Does the drill you're looking at using have variable speed trigger?
If so you should be able to do it mechanically using a servo I reckon.
Might have to disassemble the trigger on the drill (Probably a good idea to ahve a backup just in case) and figure out what does what, and then hook it up to a servo.
The servo would then do the same job as your finger pushing the trigger on the drilll.
The trigger should have a spring inside it making them return to the ''OFF'' position when you let go with your finger.
I reckon you could get that spring out, and with some linkages and shed ingenuity make a servo allow you to have variable speed control.
For reverse you could have a second servo set up to (also mechanically) flick the ''FWD/REV'' switch on the drill.
Depends on how tricky you wanna get of course.
Does the drill you're looking at using have variable speed trigger?
If so you should be able to do it mechanically using a servo I reckon.
Might have to disassemble the trigger on the drill (Probably a good idea to ahve a backup just in case
) and figure out what does what, and then hook it up to a servo.The servo would then do the same job as your finger pushing the trigger on the drilll.
The trigger should have a spring inside it making them return to the ''OFF'' position when you let go with your finger.
I reckon you could get that spring out, and with some linkages and shed ingenuity make a servo allow you to have variable speed control.
For reverse you could have a second servo set up to (also mechanically) flick the ''FWD/REV'' switch on the drill.
Depends on how tricky you wanna get of course.
Yeah i was thinking about that, but i thought with the brains and the experience available for the picking in here there might be a simple, cheap alternative out there. My new radio is six chanel so it wouldnt be a problem chanel wise.
Thanks for the thoughts mate
Cheers
Troppo
01-25-2010, 05:36 AM
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RE: Speed control help needed for home build
ORIGINAL: da mad maori
i think Jaycar have a 12 volt motor speed controller kit.... controlled by a knob which i would guess you would hook a servo arm up to....
i think Jaycar have a 12 volt motor speed controller kit.... controlled by a knob which i would guess you would hook a servo arm up to....
