Wiper Shaft Knurling on Taper???

[Mr. Wizzard]

Well, i now have something i am quite inexperienced with, to do. I'm not a lathe guy, but sometimes I can fake it pretty good. So far, not had to CNC knurl anything. Now i have a new job.

-1018 steel

-wiper motor shaft

- #96 Class 1 straight knurl over 19.5 degree taper

- Haas GT-10 lathe

 

I already did a search and found some basic information that will help me out, but i'm looking for a little bit more.

 

- Anyone done similar knurling have any advice?

- How do you check the finished part?

- Where can i find the spec on this type?

 

This will be mating with another part that I will not be making. Are there "gages" for this kind of work, or some other way to check it?

 

TIA, i know you guys will help me out!!

 

[ 08-27-2010, 08:18 AM: Message edited by: Mr. Wizzard ]

[John Summers]

That's a lot of taper for a knurl. If you did the large end and small end diameters independently, there would be a different number of knurl points on the circumference. I think you need to mill it, rather than knurl it. You really need to get ahold of a mating part. I hope you post the final solution.

[Mr. Wizzard]

It's 9.75 degree taper from centerline, total of 19.5 degrees. Larger diameter is 0.437". The lenght is 0.340" Don't know if that makes a difference, but i wanted to add some details.

thanks, for the reply.

 

And, yeah, waiting for the "engineers" to get me detailed specs on this type of knurl and a mating part

[Vince B]

I did something similar years ago. We used a woodruff style thread tool and cnc milled them in a fixture that was purpose built to hold the shaft and index as needed. We used gages supplied by the customer. You could have a gage wire edm'd once you have the specs.

[Mr. Wizzard]

Have been able to track down what we think is the answer, with the help of Accu-Trak tooling. It appears to be a DIN spec wiper shaft to DIN 72783. I'm guessing that nobody felt like researching it and just threw something on the print cause the part looked knurled.

I found this link and I'm pretty sure this is the route we're going to take.

 

http://www.boeni-ag.com/flash/video/v2D1.swf

 

Check it out, it's pretty sweet!

[Guest]

Now that was cool.