Need help designing keyway in gear

[Matt Adams]

Originally Posted by sanddrag

Are you still confident that it can take the load? What about when slamming between forward and reverse (which we'll try not to do but it would be good to know if we should worry or not). Thanks again.

Use part number 98535A125 from McMaster. ($1.50)

It's a high carbon steel with a tensile strength of 95,000 PSI. That'll boost your factor of safety above 3.

No worries.

Matt

[sanddrag]

One last quesiton. It seems as if my brain has malfunctioned once again and I didn't order those gears when I thought I had. Anyway, I can't fully understand all the calculations but since you guys do, can I just ask will a .688 length through bore be okay, or do we really need the .940? Because all I can get locally is .688 through bore. Also, for that key stock you posted, is that a safety factor of 3 on the .5 length through or .94? Thanks so much. You have no idea how much I appreciate this.

[Max Lobovsky]

Originally Posted by Matt Adams

Use part number 98535A125 from McMaster. ($1.50)

It's a high carbon steel with a tensile strength of 95,000 PSI. That'll boost your factor of safety above 3.

No worries.

Matt

I was sure steels were commonly over 70k psi, I should have pointed that out.


Sanddrag, with a good steel key like Matt pointed out, you will have a safety factor of over 4 or 5. You should be fine.

[Travis Covington]

Hex broach? Haha, people these days will broach a hex in anything! No key to lose!

[sanddrag]

Originally Posted by Travis Covington

Hex broach? Haha, people these days will broach a hex in anything! No key to lose!

I think I know what that wink is for. And likewise. Let's just say we both get influenced by the same guy whose intials are AB, if you know what I mean. (And travis, I hope you don't stick another stage on the end of last year's tranny for six speeds, that would be absolutely insane.)

Anyhow, a hex broach would be great, but the shaft this gear is on is .500" diameter up the line a bit, so machining down to a 3/8" hex on this round shaft wouldn't be too fun. Nice idea though.

[Travis Covington]

another stage would make 8 speeds! haha!

Either way, it looks like the 3/32 will work fine for you. What function is this gear train for?

Goodluck, can't wait to see what it is!