Need a momentary switch to switch about 40 amps to a DC moto
Need a momentary switch to switch about 40 amps to a DC moto
I have a DC motor (a starter off an old marine engine) that pulls about 30 to 40 amps on 12 volts. I want to use it for light intermittent duty (starting a large single cylinder model engine of about 72cc). Any suggestion such as "Will an FET be suitable to use as a switch?" or should a contact type switch be used. Any suggestions or circuitry will be appreciated. Power source is a 12 volt lawn mower type battery or a car battery. The mechanical connection between the DC motor and engine being started is simply a friction cone held against the spinner on the model engine.
- dacflyer
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you can get theose starters from any hobby shop for about 40-50 dollars
they already have the switch on the motor..
probably can find them cheaper on ebay.. but then again i am not sure what the limits are ( what size engine is the max for that starter )
but then again, they also make gear reduction starters as well...
good luck
they already have the switch on the motor..
probably can find them cheaper on ebay.. but then again i am not sure what the limits are ( what size engine is the max for that starter )
but then again, they also make gear reduction starters as well...
good luck
dacflyer wrote:you can get theose starters from any hobby shop for about 40-50 dollars
they already have the switch on the motor..
probably can find them cheaper on ebay.. but then again i am not sure what the limits are ( what size engine is the max for that starter )
but then again, they also make gear reduction starters as well...
good luck
I am aware of the availability for these but, to start this large a motor, the cost is more like $150 so I'm trying to get by for a lot less money. My problem so far is getting a switch that will stand up to the high currents.
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Back in the 1970's before commercial model starters were common, we used windshield wiper motors available from salvage yards for less than $5.00. We used flipper switches from old pinball machines to switch the wiper motor. Similar switches are available, I believe, at All Electronics and other surplus stores. If the current eats your switch, I agree with the previous poster that a Ford starter relay will probably outlast you, as they switch several hundred amps of 12 volt for years.
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