Re: Cordless drill motors

["Marc en Wendy" <marcmethorst-at-zonnet.nl>]

Thanks Joe, this was the info I needed.
I am currently gathering lots of parts, I allready got the Anvilus
controller (one of those you shipped to Holland) and am now orientating on
the R/C-front about motors, transmitters and so on.
Tomorrow I will test my modified track system in the sand, so then we will
know if I have to switch to the T34 or similar system.

Marc

----- Original Message ----- 
From: "Joe Sommer" <anvilus9-at-adelphia.net>
To: <tanks-at-rctankcombat.com>
Sent: Friday, September 03, 2004 11:33 PM
Subject: Re: Cordless drill motors


>
> Marc,
>
> At 06:00 PM 9/3/2004 +0200, "Marc en Wendy" <marcmethorst-at-zonnet.nl>
wrote:
> >Is there anyone out there who is still using cordless drill motors
instead
> >of changing to EV Warriors?
>
> I originally used 12VDC Makita 6216D cordless drill motors
> for Hetzer #T010 using a 1:1 drive ratio from the motors to
> 4 inch diameter drive sprockets.  They provided 400 rpm
> for low speed and 1300 rpm for high speed.  Makita specified
> 320 in-lbf maximum torque.
>
> The Hetzer was very fast but slightly under powered.  I could
> do full-skid turns (e.g right track forward, left track reverse)
> on pavement and short grass, but could only do half-skid
> turns (e.g. right track forward, left track off) in heavy grass.
>
> I recently switched to 24VDC Makita BDF46 cordless drill
> motors with the same 1:1 drive ratio and sprockets.  They
> provide 460 and 1500 rpm with 476 in-lbf maximum torque.
> Hetzer #T010 is now very fast and very powerful.
>
> >If there are, I would like to know:
> >- how they perform,
>
> I have not yet tried the 24VDC motors in battle,
> but I am very pleased so far in field trials.
>
> However, remember that Hetzer #T010 has the shortest
> ground contact length (18 inches) and is the lightest
> tank (75 pounds) that has been in battle.
>
> Heavier tanks and those with longer ground contact
> length will require more torque.
>
> >- if they use the max torque safety system of the drill for when the
> >tracks lock up,
>
> I have never locked a track.
>
> I have stalled the tracks in heavy grass.  The max torque
> adjuster did not engage.
>
> >- do they generate a lot of heat.
>
> Not really - The Makitas have tiny cooling fans in the back.
>
> Almost all tankers are now adding cooling fans even
> to their EV Warriors.
>
> >Also, I noticed there are lots of cheap cordless drills for sale that run
> >on 14,4 V. These will probably also do fine on 12 V, but does anyone have
> >experience with this?
>
> Operating a 14.4VDC motor at 12VDC will reduce
> the torque considerably.
>
> Also you will need to get cordless drills that have 2
> or 3 speeds and use the lowest speed for 1:1 drive.
> Otherwise you will need to provide external speed
> reduction ratio of about 3:1 from the motor to the
> drive sprocket.
>
> Personally, I recommend 24VDC drill motors
> or 12VDC EV Warriors.  If you really want speed
> and power, you can run EV Warriors at 24VDC.
>
> >I have now put through some modifications (a different rubber liner on
the
> >drive wheels, a stronger tensioning system and reinforced motorframe) and
> >will hopefully be able to test this during this weekend.
>
> If your guide horns on your inner track links are
> strong enough, you can actually drive the horns
> using a sprocket with rollers similar to the
> original T-34 drive system.
> http://www.gjames.com.au/chris/t34/fullsizecad.html
> http://www.battlefield.ru/t34_76_4.html
>
> Best wishes,
> Joe
>
>
> **********************************************
> Joe Sommer
> 2378 Nantucket Circle, State College, PA 16803
> 814.234.4773     anvilus9-at-adelphia.net
> http://www.anvilus.com