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Post by gnome on Feb 17, 2019 15:57:30 GMT -7
 
Here is pictures of the dyno I made, I run it off a lawn tractor battery. |
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Post by dave632 on Feb 17, 2019 16:11:02 GMT -7
Looks good, how do you keep the car on the driven wheel? I am thinking of some kind of hold down strap for mine just like they
do with full size.
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Post by gnome on Feb 17, 2019 21:49:16 GMT -7
I have it hooked to a controller if you roll on the throttle its not bad ,if you try to get really aggressive with the body on I'll hold it with one hand or lay something on it with the body off a dental hook over the front axle works. If you're not paying attention it will pitch your car when you cut the power. You can also run the leads from the slave motor to power.
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Post by GTS on Feb 17, 2019 21:54:29 GMT -7
That's cool gnome!  Curious where that roller originated from. I went and drug my old 1/24 slot racing box out of the attic today, that was fun going thru  . I think I got enough parts to make one similar to Dave's & SKR's. Got a Parma Womp chassis that's just beggin' to get converted  . It'll be fun! I'll post some progress pics when it happens. |
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Post by gnome on Feb 17, 2019 22:06:51 GMT -7
The wheel is a length of pvc with rubber washers glued in and a long drill bit shank for an axle with ball bearings. Works good
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Post by GTS on Feb 21, 2019 16:48:06 GMT -7
Here's a little bit of progress on my version of the Dyno. Just the basics so far. Granted, the motor seems a bit big and might be a potential for "too slow, too much work" but thought I'd try it. Easy enough to remove. Won't know till I get the rails installed and power hooked up. We'll see how it does .
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Post by dave632 on Feb 21, 2019 18:00:11 GMT -7
Gale that looks like quite a load for an HO car since there is about a 3-1 gear multiplication to the motor. I would suggest a direct drive to the
Motor without the pinion and crown, then I think you will be OK. I used surgical tubing to connect the 2. The rpm counter I used is available on E bay pretty reasonably. It comes with a special tape which helps it read the rpms. I used 2 on my rig so it would be close to 1 rpm for the rear HO tire. Other than that your rig looks good.
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Post by GTS on Feb 21, 2019 18:28:09 GMT -7
Thanks for the feedback!
Yeah, I'm pretty confident that it's not going to work as is . I even question the Parma motor hooked up direct. I kinda think it'll still be too much of a load. I have a couple pretty small mabuchi (?) can motors from some old 1/43rd slot cars. I'll probably try to hook one of those up direct. Should be a little less load, I'm thinkin'. I should be getting one of those RPM Tachs in the mail tomorrow. I been wanting one any way to use on certain projects with the CNC so it'll be pulling double duty  . It's just like the one you have. It's definitely been a fun project so far and has kept me occupied while I'm waiting on some T-jet parts . |
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Post by GTS on Feb 21, 2019 19:31:38 GMT -7
Got some leads soldered onto the rails and installed. Hooked it up to 9 volts and that T-jet wouldn't even budge them rollers . Disengaged the gear on the motor and it took right off. Not to shabby for 9 volts, eh? I got a 12v 5 amp supply I'll hook up tomorrow, that should be an improvement. Still a ways to go but still fun!
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Post by dave632 on Feb 21, 2019 20:29:24 GMT -7
It looks like you are making some nice progress.
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Post by gnome on Feb 22, 2019 6:15:20 GMT -7
Looks good Gale, i use 12 volts with 280 amps for mine and it seems to work well.i to have my slave motor hooked directly to the wheel shaft with a piece of vacuum line like Dave632. I used a 6 or 9 volt radio shak motor held in place with a 9v battery holder. I've also played around with different resisters wired in with the motor. I have found its a tool that gets lots of use at motor city raceway not so much for rpm reading but for making the car run smoothly. Keep it up looking really good. Gnome
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Post by dave632 on Feb 22, 2019 6:18:40 GMT -7
I used a pot wired across the motor to increase or decrease load which make it adjustable. The amp/volt meters are available on e bay reasonably.
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Post by gnome on Feb 22, 2019 7:08:26 GMT -7
Good idea with the pot i would like to wire a pot into the power supply for the car for run in purposes ,i use a controller to run the car currently
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Post by GTS on Feb 22, 2019 7:37:31 GMT -7
Thanks for all the tips and encouragement! Say Dave, any chance you could share the approximate value of that pot you have hooked into the dyno load motor?
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Post by dave632 on Feb 22, 2019 10:02:23 GMT -7
I will have to check it, don't remember off hand. It was just something I had laying around so it may not be ideal.
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. I think I got enough parts to make one similar to Dave's & SKR's. Got a Parma Womp chassis that's just beggin' to get converted 
. It'll be fun! I'll post some progress pics when it happens.
. It's just like the one you have. It's definitely been a fun project so far and has kept me occupied while I'm waiting on some T-jet parts