Press fit pin retention
Press fit pin retention
(OP)
We currently pin two concentric shafts to form a torquemeter. We use five pins around the circumference of the shafts. The pins are inserted radially from the outside. We weld over the tops of the pins to insure they do not come loose under heavy vibration. We would like to eliminate the weld. Is it possible to just use a heavy press fit? Do we need to stake or swage the pin? Is there s special type of pin we should be using?
Also, we machine a flat on one side of the pins. The purpose is to allow air to escape during the pressing operation, as the inside shaft is not drilled all the way through. Is this common practice? Is it really necessary?
Thanks for any help you can provide!
Matt
Also, we machine a flat on one side of the pins. The purpose is to allow air to escape during the pressing operation, as the inside shaft is not drilled all the way through. Is this common practice? Is it really necessary?
Thanks for any help you can provide!
Matt





RE: Press fit pin retention
http://www.groov-pin.com/products.htm
www.spirol.com
Both of these people make groved solid pins that are extrememly resistant to vibration. They have good design information.
Why do you have vibration?
RE: Press fit pin retention
RE: Press fit pin retention
thanks,wic43
RE: Press fit pin retention
RE: Press fit pin retention
RE: Press fit pin retention
If you look at the grooved pin you can see that it is a mechanical fit because of the upset groove.
Also you can double spring pins to help both in the load carrying capacity and stay at home properties.
Our use for the groove pins were in drive shafts going around 100 RPM with a single Cardan u-joint and one end free.
RE: Press fit pin retention
I know that roll pins do work lose. I just need assurance that the groove pin absolutely will not work lose before I can propose it. We are turning 15000 rpm on a 4 inch diameter. Thanks for all the help and info! If anyone else has an opinion on locktite or groove pins, it would be greatly appreciated!
RE: Press fit pin retention
If this is still a problem try the following site concerning the Polygon Drive. It was used on a lot of our high speed
http://www.jobshop.com/techinfo/papers/g...
I never like grind a flat on a sold unless it was absolutely necessary.
RE: Press fit pin retention
Here is all the URL ofr the Ployegon Drive
http://www.jobshop.com/techinfo/papers/g...
RE: Press fit pin retention
http://www.driv-lok.com
Do you have any high heat situations? Because some loctites are not the best under heated conditions. Check out their website www.loctite.com for more info.