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Thread: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

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Old 11-22-2013, 03:36 AM   #241
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

All ordered Sudu FL's have now shipped.

I will build up new stock asap. I expect to have them available again within two weeks from now.

Looking forward to see build threads of the FL version!

Tomi
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Old 11-23-2013, 10:57 PM   #242
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

I was informed yesterday that some of my AX10 4-link plates have the flat head screw countersinking on the wrong side of the plate. If you have received a faulty plate, please pm me with your shipping address and I will send you a new plate immediately.

I apologize for any trouble this may cause you.

Tomi
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Old 11-24-2013, 09:15 AM   #243
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

I have done some fine tuning of the transmission during the weekend. I also took the tranny on a weight loss program. I even experimented with plastic and alloy gears but have not had satisfying results with that yet. It would be cool to install 7075 gears at 2g/each. Stock are 7g.

I ended up the traditional route and drilled out the gears to save 2g/gear. Thats about 27% off stock weight of each gear. I also made a thinner front plate for the housing loosing another 1.3g.

With alloy hardware and drilled out gears final weight is at 43.5g.






I also finished the general purpose unit. While the Sudu One FL specific version needed to be as low as possible, I set out to make this unit as narrow as possible. This brings with it a slight increase in height. Overall width with a standard size 540 motor and 17 pinion gear is 53.5mm. The transmission only is 50.5mm wide.

Weight of this unit is 42.5g with drilled gears and alloy hardware. This unit will fit all Sudu One versions except for the FL chassis. The FL unit has a lower cog due to the gears sitting lower in the housing.


Last edited by Tomy; 11-24-2013 at 09:59 AM.
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Old 11-24-2013, 10:07 AM   #244
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That's great work tomi. Once I have my gears, I ship them, with a little present, to Finland

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Old 11-24-2013, 10:42 AM   #245
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

Please do. If anyone else needs help drilling gears out I am willing to do it for you as long as you pay for shipping both ways.
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Old 11-24-2013, 12:46 PM   #246
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Love both versions. I hope my bad times will come to an end soon. You Make me want to put my rig on the slab!
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Old 11-24-2013, 01:35 PM   #247
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

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Originally Posted by musta View Post
Love both versions. I hope my bad times will come to an end soon. You Make me want to put my rig on the slab!
I wish all the best for you, Tommaso!
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Old 11-27-2013, 10:20 AM   #248
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

A few last changes to the skid plate were made today and this is how it shipped out to testers.











With the addition of one extra mounting hole to the skidplate, the transmission can be mirrored in all possible ways - endbell facing forward or towards the rear and with the motor on either side. Any combination is possible with one skid plate.

I also made a 1.5mm thick shim plate in case you will need to adjust the height of your transmission. Why not use simple M3 spacers between the skid plate and transmission you may ask? The weight of the motor causes a lot of leverage on the transmission mounting and the use of spacers only would put a lot of stress on the two M3 screws and thin alloy cross members in the transmissioin. Fastened with a full width shim, the transmission is supported along the full width of the housing and mounting screws and alloy cross members face much less stress.

Last edited by Tomy; 11-27-2013 at 10:29 AM.
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Old 11-27-2013, 11:42 AM   #249
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

Can't wait to receive my tranny..... ;)
Long shaft is in the house, Only the r2 gears.... (but i have to send them to you first tomi)
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Old 11-27-2013, 12:00 PM   #250
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Agread. Cant wait to get. My donar R2 sitting on the bench waiting.
Fine tuning sounds great Tomi

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Last edited by Oz Bruiser; 11-27-2013 at 12:54 PM.
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Old 11-27-2013, 12:37 PM   #251
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

...Tomi did't stop searching for new detailed solutions and opportunities for improvement I think the shim plate could also very helpful for the people who are interested to get the universal custom transmission housing for easy fixing in their chassies.

Great Job, Tomi
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Old 11-27-2013, 12:43 PM   #252
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Awesome work Tomi Great improvements to make the tranny more versatile .... I LOVE IT .... can't wait !
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Old 11-28-2013, 09:02 AM   #253
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

On the gear mods -- what do you think? Couldn't we narrow the gears since they're probably overkill on strength, and thin the "web" below the teeth instead of drilling it? Cross section kinda like an I-beam. It would be a U-shape groove under the teeth both sides, if that helps explain it. Your hole pattern would be stronger if there were thrust forces, but there aren't. So the thinned web might have the advantage for rotational forces. All just speculation.

Have you taken the opportunity to compare the gearing of the new tranny to the AX10? For example, I think I use a 14/90 on pinion & spur. Is there a pinion that will give me the same overall reduction on the new one?
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Old 11-28-2013, 01:49 PM   #254
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

I dont know the exact gearing of the R2 gears or how they compare to the AX10 transmission.

But I asked Totorax for advise on what to run with a 35t motor and he told me he is using a 17t pinion. I have used that while drawing up the transmission. There is room to use a smaller or bigger pinion gear.

You guys will have to test and report back on what works.

To lighten the gears by cutting a circle U-channel would probably work but is much slower for me. Drilling them only takes a few minutes.

I am still hoping to be able to make 7075 alloy gears at 2g/each.
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Old 11-29-2013, 10:38 AM   #255
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I got this off the RC4WD website ...

Gearing :
8T pinion = 30.4:1, 9T pinion = 27.0: 1, 10T pinion = 24.3:1,
11T pinion = 22.1:1, 12T pinion = 20.3:1, 13T pinion = 18.7:1,
14T pinion = 17.4:1, 15T pinion = 16.2:1, 16T pinion = 15.2:1,
17T pinion = 14.3:1, 18T pinion = 13.5:1, 19T pinon = 12.8:1,
20T pinion = 12.2:1

link: R2 Crawler Transmission V2

Last edited by Haastnooit; 11-29-2013 at 10:42 AM. Reason: typo
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Old 11-29-2013, 03:57 PM   #256
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

Okay then, doing the math, Axial says the AX10 tranny is 2.6. I think the stock spur is 89. So the overall ratio is 231/pinion. For a 14T pinion = 16.5. Close to the R2 tranny at 15T pinion. So use maybe one tooth more than you're used to.
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Old 11-29-2013, 10:21 PM   #257
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

Thanks for doing the math for us, Bill.

At least in the old days the stock spur on an AX transmission was 87t.
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Old 11-30-2013, 02:17 AM   #258
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Correct stock Axial spur would be 87T
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Old 12-01-2013, 01:20 AM   #259
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Quote:
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I am still hoping to be able to make 7075 alloy gears at 2g/each.
I'm sure you could do that, Tomi
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Old 12-04-2013, 11:15 PM   #260
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Default Re: NCD High Performance Carbon Fiber 2.2 Shafty/Sportsman Chassis

Sudu FLs are in stock.
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