Discussion about possible aluminum transmission and parts

[SnoopMaxx]

How's this ?










Morten

[300D50]

That is awesome, thanks a million!

Now I know the stock needs to be at least 1/2x2x4 for the set. Now to rough-model this puppy up!

Is it ok if I use two or three 1/8" dowel pins instead of a raised lip for locating the trans halves?

[kaiser]

if he ends up doing a run of any of these parts do you think doing some in delrin would be a possibility? I really don't want either in aluminum, but would jump all over some delrin parts, and I'm sure a few others on the borard that are more in the racing spectrum would be into them as well.

i'd be all over that. delrin > alloy

[SnoopMaxx]

That is awesome, thanks a million!

Now I know the stock needs to be at least 1/2x2x4 for the set. Now to rough-model this puppy up!

Is it ok if I use two or three 1/8" dowel pins instead of a raised lip for locating the trans halves?

Are you using Nylon 6-6 or Delrin ?

What grade of alloy will you be using ?
I use mostly 6082 T6 when turning parts on my lathe

Morten

[300D50]

For this, likely Delrin/Delrin AF on the plastic/composite ones, and 6061-T6 for the aluminum ones.

If made with Delrin AF(Teflon impregnated), the bearings could possibly be eliminated from the trans for race applications. Don't hold me to that though, since I likely am overlooking something... EDIT: like the fact that the AF is 6 times the price of the regular Delrin... so scratch that i guess.

Never worked with 6082, but it seems it has a higher tensile strength. Any reason to use it over 6061 besides the added safety margin?

Think you can get a rough depth figure for the bearing bores from the part face? Sorry to keep pestering, I tend to soak up knowledge like a sponge... problem is wringing it out of the grey matter when needed!

[SnoopMaxx]

I use it as a center in a steel gear
and the 6082 has a better surface finish when milling and turning
as well as being stronger




Right ... Bore depth, inner diameter and outer diameter



Morten

[300D50]

Thanks Morten!

Do you use HSS or carbide tooling when you turn aluminum? I find the carbide makes all the difference in surface finish, but it's $$$ up front...

Did you make the gear as well?

Are the forces at work in these gearboxes extreme enough a 6061 center would show more wear? I'm new to this, so I honestly don't know.

Looks like nothing is too small for me to easily machine, stock is reasonable, and this shouldn't take too long to punch out.

[SnoopMaxx]

Both ...
I buy the gears precut and turn the inside dia. and center on a manual lathe,

Well the standard gears in that gearbox is moulded plastic
There's an upgrade alloy gear set but with a top speed of around 35-40mph they last 5min
The ones I made for Jonny has lasted for over 2½ years with no visible wear
and He use a 5700kv motor on 3s 11.1v LiPo
These trucks normally drive on 7.4v and has a top speed of around 15mph

Just have a look at this video
http://www.youtube.com/user/xjonny26#p/u/5/9Y0i59E66BE


If the prize is right I would consider buying a gearbox, bulkhead and rear mount

Morten

[300D50]

That vid is awesome! I have an ear to ear grin on my face right now!

Ah, so you bore the center out to fit, that makes a lot more sense than making the entire gear.
Plastic gears have always made me cringe...

[SnoopMaxx]

That vid is awesome! I have an ear to ear grin on my face right now! Indeed

Ah, so you bore the center out to fit, that makes a lot more sense than making the entire gear. Yeah it does
Plastic gears have always made me cringe...ME TOO

If you need any more measurements, just let me know
Morten

[300D50]

That should be enough till I get the stuff from Johnboy and can throw it on the CMM.

This weekend just had something come up, so looks like it's 3 weeks out for that.

[wyldbill]

why dont you see if you can get a hold of the aluminum case that askbob bought from pbr and compare the stock nylon to the aluminum and see which one would be easier to machine.

[300D50]

I'd rather just reverse engineer the plastic one. Takes the same amount of time either way.
That, and I'd feel a bit shady copying an individuals design vs a corporation/companies. Ethics are funky like that I guess.

[flipwils11]

This is really moving fast, impressive. If the aluminum one is available in time I will have to put it on my next build and get it anodized a cool color.

[300D50]

Ok, I'll bite the bullet.

Anyone have an issue with $50 for a case?