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Old 02-21-2016, 06:12 AM   #16
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Ok, so I received the spur gear and the pinion... Sadly it won't be possible to use a 48DP transmission... Even with the biggest spur gear the corresponding pinion (same final ratio as initial) won't touch !

So now multiple choices:
- Abandon this conversion (it would be sad because module one is very loud)
- Persist and design a fully custom 48dp spur gear... Designing will be easy, but get somebody printed with quality material
- Try to go for 32DP transmission, but there are not a lot of spur gear on the market...
- Redesign motor support, to make it lighter and compatible

I think I won't go for any of this solution before I have the occasion of running the car on our track...

Tom ,still waiting on your modifications details ;-)
Use 32 pitch gears. I still use them on my 1/10 pan cars. Several sizes of spur are available, made by Kimbrough and others. The Kimbrough #129 is 54T, and the #249 is 66T; will one of these work for you?

Robinson also has a huge range of 32p pinions-- 8T to 23T-- with 1/8" bore, and others make 32p pinions with 5mm bore for use on larger motors.
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Old 02-21-2016, 06:15 AM   #17
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looks like a nice kit.. Also this car transmission would be 1:1 right?
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Old 02-22-2016, 02:53 PM   #18
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Sadly, I doubt that these kind of spur gears will be big enough... I've tried with a 96T and a 20T pinion in 48DP, so...

If you have any spur or pinions in 32DP, could you please measure their diameter and tell me back?

It would be a great help...
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Old 02-22-2016, 04:35 PM   #19
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Sadly, I doubt that these kind of spur gears will be big enough... I've tried with a 96T and a 20T pinion in 48DP, so...

If you have any spur or pinions in 32DP, could you please measure their diameter and tell me back?

It would be a great help...
For 32 pitch, the pitch diameter of the 66T would be 66/32=2.062"=52.4mm, and the overall diameter is about 2.14"=54.4mm (measured). I'm afraid if you used larger, the gear would contact the track, pebbles, etc. Kimbrough makes up to a 72T 32p spur, but it's for a Traxxas vehicle, so the hole pattern is different. That might not be a problem, since you are making an adapter for it.

What gear ratio do you need? What is the minimum center-to-center distance of motor shaft to axle on your car? If the gears you mentioned (20T/96T) are the ratio you want, then a 14T pinion and 66T spur would be close to the same ratio. That gives a center to center distance of about [(14+66)/32]/2=1.25"=31.8mm. A 15T spur and 72T pinion gives 1.36"=34.5mm.
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Old 02-22-2016, 05:09 PM   #20
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Quote:
Originally Posted by Airwave View Post
Sadly, I doubt that these kind of spur gears will be big enough... I've tried with a 96T and a 20T pinion in 48DP, so...

If you have any spur or pinions in 32DP, could you please measure their diameter and tell me back?

It would be a great help...
RW has 48p spurs up to 105T, and pinions up to 45T if I am not mistaken.
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Old 02-23-2016, 03:32 AM   #21
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any problem when you use 1/10 electronic with this car???... i have Edam razor electric and it is too heavy to can use 1/10 electronic...
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Old 02-23-2016, 03:46 AM   #22
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Hi

@ Airwave: I milled the thickness of all the bearing blocks from 8mm approx. 1 to 1.5mm on each side like an I-shape (let full thickness at screwing positions). So the front ones are 5mm in the middle, the rear ones 6mm.
I also removed the motor plate...

Regarding the main gears discussion: the original designed main gear is a molded one from the old Italian company MantuaModel. It is an original spare part of a former 8th nitro pan car. The loudness is because the design of the teeth seems not to be the very correct evolvent. It is a cheap part even as a spare part.
The gear is module 1 with 56 teeth, so the working diameter is 56mm. In the original design of the car the motor pinion can be between 10 and 15 teeth. Calculating with 14t the distance of the axes is 35mm...
I am searching for a solution with a higher quality and less sound, but my opinion is to stay at module 1 as it is the most robust one.

Best regards,
Tom

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Old 02-23-2016, 02:33 PM   #23
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Very very interesting...

Thanks for the indications... I just find a 32P 70T spur gear for Traxxas Stampede. The center hole is 11mm, but I think it could be adapted... Used with a 18T pinion, it should be good...



I'm tempted, I think I will order these two and try to change my adapter



Thanks.

Last edited by Airwave; 02-23-2016 at 03:10 PM.
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Old 02-24-2016, 03:14 AM   #24
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A 70T 32p spur has precisely the same diameter as a 105 48p spur... so what's the point?
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Old 02-24-2016, 12:00 PM   #25
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Availability dude...

I can't find a web shop selling this RW spur...
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Old 02-25-2016, 01:33 AM   #26
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You can ask RW here: http://rwracing.co.uk/contact.html
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Old 03-17-2016, 12:07 AM   #27
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Impressive,like it!!!
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Old 03-17-2016, 10:18 AM   #28
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Quote:
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I just finished a custom made BURI-Racer E1 leightweight:

all screws titanium and aluminum parts reworked
the rear axle is the original stainless steel one

motor: Tenshock TS SC-401 - 3400 RPM/V diameter 36mm with 5mm shaft
esc: SkyRc Toro TS120A (3s)
battery: 3s 5500 45c

chassis weight with all components 1535g
ready to run: 1880g

not bad for a 1/8th ?!
hi,

this config lightweight inspired me,but is it reliable ? for electronics of course.

thanks
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Old 03-18-2016, 09:10 AM   #29
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I will run my E1 tomorrow with 1/10th electronics... I'll keep you updated... The backup plan is to install short course electronics...
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Old 03-20-2016, 07:55 AM   #30
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Ok the result is not as impressive I was thinking... The car is too heavy for the 540 motor... If I run the car smoothly, you can achieve ten laps, but if I try to attack a little bit, the motor heats a lot and cut after 2 laps (124 C)

So I'm now going for Short Course electronics, it should be fine.

What pinion are you using with the 3s configuration? The original one?
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