Replace cordless drill speed control with simple on off switch?

[John Doe]

I am powering a wheel to propel me on in-line skates.
(see the powerful "roller cycle on grass" video on YouTube)

Using a DeWalt 18 V cordless drill. If I want to replace the speed
control trigger with a simple on/off switch, what sort of
components would be required? I guess a simple resistor and
capacitor with the switch? A high wattage resistor? I guess a few
seconds delay would be enough.

Thanks.



By the way... Apparently DeWalt is not using a motor housing for
their compact drills. The motor is not just hanging behind the
gearing, but the motor parts themselves are held together by the
plastic. The windings rod/shaft (armature?) is screwed into the
plastic case, and the outer metal cylinder (commutator?) is held
in place around the windings by the plastic casing. I wonder
whether any resulting lack of precision might negatively affect
motor efficiency.

 

[Jasen Betts]

I am powering a wheel to propel me on in-line skates.
(see the powerful "roller cycle on grass" video on YouTube)

Using a DeWalt 18 V cordless drill. If I want to replace the speed
control trigger with a simple on/off switch, what sort of
components would be required? I guess a simple resistor and
capacitor with the switch? A high wattage resistor? I guess a few
seconds delay would be enough.

Why not use the dewalt speed-controller possibly mounted in another
handgrip, it'll be a bit like driving a slot-car.

By the way... Apparently DeWalt is not using a motor housing for
their compact drills. The motor is not just hanging behind the
gearing, but the motor parts themselves are held together by the
plastic. The windings rod/shaft (armature?) is screwed into the
plastic case, and the outer metal cylinder (commutator?) is held
in place around the windings by the plastic casing.

most drills are built tat way.

I wonder
whether any resulting lack of precision might negatively affect
motor efficiency.

plastics can be made to fairly tight tolerances. it;s not like the
pole pieces on the armature or stator are preciscion machined

 

[John Doe]

Why not use the dewalt speed-controller possibly mounted in
another handgrip, it'll be a bit like driving a slot-car.

I did slot cars as a kid on a huge track. Decades later, and years
ago, they put the same track back in the same mall. It was fun.

The only real problem here and now is that the trigger spring
pressure needs reducing. But it will probably be left as is,
considering the risk of destroying the PWM controller.

 

[Tom Biasi]

"John Doe" wrote in message

I am powering a wheel to propel me on in-line skates.
(see the powerful "roller cycle on grass" video on YouTube)

Using a DeWalt 18 V cordless drill. If I want to replace the speed
control trigger with a simple on/off switch, what sort of
components would be required? I guess a simple resistor and
capacitor with the switch? A high wattage resistor? I guess a few
seconds delay would be enough.

Thanks.



By the way... Apparently DeWalt is not using a motor housing for
their compact drills. The motor is not just hanging behind the
gearing, but the motor parts themselves are held together by the
plastic. The windings rod/shaft (armature?) is screwed into the
plastic case, and the outer metal cylinder (commutator?) is held
in place around the windings by the plastic casing. I wonder
whether any resulting lack of precision might negatively affect
motor efficiency.




--
FWIW. Motor power is irrelevant at this time. I am not asking
whether the 18 V motor is powerful enough for this application, or
about battery life.


If you want to run the motor at full speed you don't need any parts except
the switch.

Tom

 

[Bob Masta]

Glen Madland (ICE) and son used to build dragsters powered by a car
starter motor and 8 car batteries in series ;-)

I recall my old Rotating Machines prof pointing out that if
the field winding was opened on a shunt-field DC motor, the
theoretical torque headed for infinity. Always seemed like
a great idea to test out at the drag strip!

Best regards,


Bob Masta

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