Running 12V Drill On 18V

[Onoff]

Mate has an old but heavy duty, 12V Ryobi drill. Originally 12V Nicad.

 

 

 

I was looking into making it run on his DeWalt 18V Li-ion batteries.

 

The motor is an RS775VF. From what I can make out they have a nominal voltage of 12V but will operate between 6 & 36V.

 

 

The switch on the drill says it's good for 20VDC. As I understand it an 18V Li-ion will put out something like 21V. Not sure if this will be an issue?

 

 

Lastly what I assume is a voltage regulator. On it printed it says "C50/0 99 48 GDS":

 

 

Just tried running it on an 18V Makita battery and it seemed to run quite happily.

[Temp]

Will spin or try to spin faster on the higher voltage.  Mostly will work fine but just take care when under high load as there is greater risk of burning out the motor.

[markc]

I would give it a go, i reckon you will find it difficult to use due to over speed ... and it probably wont last very long running at silly rpm

[Onoff]

Seems the switch assembly I was worried about is common to the STP 1201, 1401 & 1801 models so 12/14.4 & 18V.

[dpmiller]

it's the power device on the heatsink thad actually drives the motor, the trigger is for reversing and speed control.

[Onoff]

I'm going to CAD up a DeWalt bottom half to 3D print then graft this to the top of the old Ryobi battery as that's got all the battery contacts in. 

 

[Gav_P]

F*** me. You really do find a lot of projects to avoid finishing the house don’t you ?

[Onoff]

  On 23/03/2021 at 17:27, Gav_P said:

F*** me.

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I'll add it to the list!