5-Speed Manual Transmission

[Krawlin]

Originally Posted by WheelChair

I don't know what experience you have with things, so I am going to try and explain it all simply.

If you were to take apart a TQ3 radio, the third channel switch has a spring and a ball. `This gives the switch positive enguagement to either side.

Meaning when the switch is one way, the spring holds it in position.

Same thing with the light switch on your wall for the house.

There is a rocker, a spring and a ball.

I would suggest to go and buy a 110v light switch, and take it apart.

It will show you better then I can explain.

Basicly it locks into position with spring pressure.

Relying on a servo to put enough pressure to hold the gear enguaged is going to:

1.) Eat batteries

2.) Not hold well

3.) Burn up servo's

The switch is only an example, sorry, I don't know the term for this action.

But it would give you an idea of what I am saying.

I was going to say like on a toggle switch that wants to stay in the off position unless to have it go to on, but the spring pushes it back to off.

Basically, what WheelChair means is, you dont want the servo being the only thing keeping the gears engaged. You want something like a spring to do the majority of the work as far as keeping it in gear.

[Charger]

Originally Posted by thorsteenster

So what maybe you ought to look into for shifting, is have it shift like a motorcycle. Or a toggle switch, forward is upshift, backward is downshift/reverse.

That'd be boring!

And thanks wheelchair I understand what you mean by spring loaded now, just need to figure out a way to make it happen.

[WheelChair]

Originally Posted by thorsteenster

So what maybe you ought to look into for shifting, is have it shift like a motorcycle. Or a toggle switch, forward is upshift, backward is downshift/reverse.

I agree but I think he is trying for an acutal scale automobile tranny...

Not to say the shifting could not be handled as you mentioned and still have it look and mostly operate like a real auto tranny....

[Thorsteenster]

Originally Posted by Charger

That'd be boring!

Why? You'd still get to shift gears. Running it, you wont be able to see if the shifter is moving in an actual shift pattern or back and forth anyway. Plus you would only need one channel for shifting, so you would have an extra propo channel for somthing.
Plus, using two servos for side to side and front to back motion of the stick, I think you can forget about speed shifting if your making a car. In a truck it would be cool.

[Charger]

But it's more scale like to be shifting with an H pattern then just moving a stick up and down(Also more fun), If I wanted that I would have gotten a Hilift tranny.

[Krawlin]

Originally Posted by Charger

But it's more scale like to be shifting with an H pattern then just moving a stick up and down(Also more fun), If I wanted that I would have gotten a Hilift tranny.

Like I said in my earlier post, maybe a small accuator on tracks. Or also as I said in my earlier post, a servo for forward and back motion, and another for side to side.

[Thorsteenster]

Like YOU said, what was the reason for helical gears?
Leave suggestions to those that know what their talking about.

[Krawlin]

Originally Posted by thorsteenster

Like YOU said, what was the reason for helical gears?

Leave suggestions to those that know what their talking about.

I said something about the Helical gears because I thought it has something to do with meshing. I didnt know it didnt have anything to do with meshing.

And I do know what alot of things about transmissions. My dad has been a Parts Manager at a Dealer Ship for about 16 years. He was also Head Mechanic at the same dealership for 14 years. Every weekend I help him with one of his old cars, and more than about 6 times we took trannies out of vehicles. He tried to teach me everything he knew about them. So I do have some knowledge for the mechanics. Even more knowledge of the mechanics of my RC trannies. And sorry for being a little confused about some of the workings. I admitted I was wrong about the curve cut/ helical cut gears having anything to do with meshing. And please dude, just lay off of me ok? I dont want another flame war. This is a very good thread and we dont need to ruin it.

[Charger]

Originally Posted by Krawlin

Like I said in my earlier post, maybe a small accuator on tracks. Or also as I said in my earlier post, a servo for forward and back motion, and another for side to side.

The servo thing is what I am going to be doing, as said in a earlier post. In fact its what started me to ever think about making one (after seeing a 1/7th scale[may have been a different size] race care WITH a working engine/clutch/shifter.)

And also, chill down... The guy made a little mistake, and he has learned from it. (Just like I will probably make a lot)

EDIT:

Also, does anyone have anything to say about using these gear combos?

12+35=47 First gear
15+32=47 2 gear
18+29=47 3 gear
21+26=47 4 gear
24+23=47 5th gear
13+12+22 R

First number, is input, last number is output. (and middle is idle for the R)

[Krawlin]

Originally Posted by Charger

And also, chill down... The guy made a little mistake, and he has learned from it. (Just like I will probably make a lot)

EDIT:

Also, does anyone have anything to say about using these gear combos?

12+35=47 First gear
15+32=47 2 gear
18+29=47 3 gear
21+26=47 4 gear
24+23=47 5th gear
13+12+22 R

First number, is input, last number is output. (and middle is idle for the R)

Thanks Charger.

And as far as gear combos, they look good to me. I like how you are going to have 5th be an over drive. Looking good man!

[CanadianCrawler]

Just something to add. If you look at the Tamiya Semi's and F-350, the gear ratio's aren't the same, and you could have enough to make a 5 speed with reverse using their gears. You would have to make up your own shafts though.

[Charger]

Does anyone know the material of the black pieces that go across that chassis? And where I can get them? Would Lowe's have them?

[WheelChair]

I believe what you are looking for is "delrin"

Don't hold me to it though, never used it.

[Krawlin]

Originally Posted by Charger

Does anyone know the material of the black pieces that go across that chassis? And where I can get them? Would Lowe's have them?

It appears to me to be Delrin. go here-- www.mcmaster-carr.com
Do a search for Delrin. And go from there. You can get blocks, sheets, rectangles, all kinds of different sizes and shapes of it. But you can buy like a big block too. Its relatively cheap, so I would go for it.

here is a quote that I got for it--

8575K1
Black Delrin Sheet 1/2" Thick, 6" X 6"
In stock at $10.86 Each

[Charger]

I want a good trustable site, one that someone who uses delrin has ordered from before.

Also, I'm going to be looking for rods, like on the shafts of 1/10th scale motors(needs to be the same size), so I can mount the pinions on them.

Any help on both of these would be greatly appreciated.

[Krawlin]

I have ordered alot of things from there, and it is a good reliable site. And you can get steel rod there too.

just go to www.mcmaster-carr.com . Type in Delrin. Find what you need. Then do another search on there for steel or aluminum rod. If i were you though, go with a bit of hardend steel rod. It will be able to withstand that much better.

[Charger]

I assume this would work great with pinion's grub screws.

"D-profile drive shafts"

Also, Anyone know the diameter of a 1/10th scale motor shaft? I would measure mine but I don't have tool for the job. (I forget the tool's name.

[WheelChair]

Originally Posted by Charger

I assume this would work great with pinion's grub screws.

"D-profile drive shafts"

Also, Anyone know the diameter of a 1/10th scale motor shaft? I would measure mine but I don't have tool for the job. (I forget the tool's name.

3.2MM motor shaft!

[Krawlin]

The tool is called "Calipers"

Yes that rod will work.

And I havent really needed to measure the shaft on a motor. Brushless motors are different, but basically most electric rc motors that are 540 size have the same shaft diameter. Ask someone like johnrobholmes from Holmes Hobbies. PM him. He will know.

EDIT: I think I found it on google....Its 3.2 mm I think

EDIT EDIT: Whoops, WheelChair already posted the shaft diameter.

[Charger]

Ummm, the site is all in standard... and I'm having a hell of a time finding a converter that won't put the standard number in a decimal.

EDIT: The D-profile rodes don't go under the size of 3/8ths and I know 3.2mm is AROUND 1/8th inch, ARGE!