emachineshop.com

[xernex]

So I'm bored waiting for a buddy to go shooting and I tune into the science channel...Beyond tomorrow is on and they feature a place called EMachineShop.

Pretty freakin awesome concept. Use their cad program, design whatever you want, submit it and get a price. I havent messed with it to see how the pricing is or anything because I'm absolutely horrid with CAD, but somehow I think this could work out nicely for some things. Maybe design some nice parts to be used for US part count and such... I imagine you could do a ton of stuff with it, and seems like it would streamline the heck out of R&D for small ventures

http://www.emachineshop.com

[turbothis]

i made a sleeve to go from 23mm to 19mm for an ak prodject and it was like 340$ maybe i did something wrong.....

[weasel_master]

I had some parts made by there. A one of a kind run will be more expensive than to run a lot. Obviously cost goes down as you spread it over more items. I believe Pirate has used it in the past before as well.

[HKfreak]

With eMachinshop pay attention to what material you are using and what machine you are using to make it with.

[turbothis]

mine was the cheapest steel and the lathe???

[rustypirate]

Has anyone used their program enough to tell me how to design a keyway into a hub?

[weasel_master]

Rusty, I am oblivious to terminology. Can you describe what you want a little? I am pretty good with CAD. Off the top of my head, was this even remotely what you were talking about? Is it something simple like this and you're just wondering how to index it or am I completely lost in the woods here?

9868

[rustypirate]

I am trying to design a part for my boat which has a tapered socket with a keyway cut into it similar to what you show, but much longer and tapered.

I already have the tapered socket done, but when I try to add the keyway slot, it tries to assign a Lathe to the job like the socket and will not let me render the image.

[weasel_master]

Can you give the dimensions at all and I'll piddle with it?

[rustypirate]

I got the dimensions from here:
http://www.kiwiprops.com/sae_taper.htm

I am using a 1.25" shaft

[walt-oxie1]

You could just have the keyway slot broached instead of trying to put it in the design. It will most likely be broached anyways if the slot is internal.

[rustypirate]

Yeah, but in order to get THEM to quote a price, it needs to be in the design...

I don't think I will use them, the price for just the tapered socket even without the broaching will run nearly $200 at their price. I am retty sure I can get it for less if I source it locally.

[okie shooter]

Rusty, how much hp are you trying to transmit, or torque, a browning split coupler might be cheaper and easier to install. Just my two cents though.

Found this quick primer on keyways,

http://www.utm.edu/departments/engin/lemaster/Machine%20Design/Lecture%2019.pdf

Still looking for an application chart, other than the one in my macheinery's handbook, covers design of taper keys there.

This one is for standard keys, not tapered, but I will keep looking for an on line one.

http://www.alliedbearings.com/downloads/falk_inch_keyways.pdf

Heres a page for inch standards, but its british standards for tapered keys(1958)

http://www.roymech.co.uk/Useful_Tables/Keyways/taper_keyways_BS46.html

Rusty in the short explination, you pick your shaft size from the list and that tells you what key stock size you should use by standard recomendations. Then you specify the relief in the shaft and the relief in the sheive,collar,gear or such to be cut by using the chart. Then you have to set the tollerances according to the chart. If you specify the key size and length you are going to use, the shop should be able to get it right, if they are cutting both, if you can supply the already cut part, they will have to match it, best to supply the key you intend to use too. Boy writing this is like work, as I get to call out key and fun stuff too.

The difference is a taper key has 1/8" taper per 12" compared to stright keys.

EDIT

Rusty, all of the info needed is there on your page.

Ingnore the above, looking at what you provided, sae is different than ansi, thus you might bring the printout from your website there, to the machine shop and give them as much as you can to get them to make it work, and then keep extra keys and such if ever stranded, as overseas unless this is common marine, you may have problems getting sae fitted parts.

[SteelCore]

Neat link! My bro is a CAD designer/engineer.