Bearing locknut (lock nut) axial access only 1

[Machina]

Hello all,

I'm wondering if someone can help me with a problem. If I'm posting in the wrong forum please let me know and I'll report or move as required.

I'm designing a machine (one off) which requires a bearing to be held securely in place on a shaft. The bearing is at the bottom of a hollow housing and access is only from one side. I won't have access to the sides of the locknut to tap a tab washer into place and even getting to angled grub screws looks virtually impossible (e.g. SKF KMTA series).

I was interested in the larger locknuts which use a plate fastened to the front of them (e.g. NTN ANL series) but they're too big for this application. I've seen similar ones for imperial sizes but I want to keep this machine metric.

I thought I'd found an ideal solution with Hiwin HIA series

http://www.hiwin.com/html/other/locknuts.html

However it looks like they're made to a higher spec. than I may require. I'm still waiting on a price and availability for one of those but am investigating alternatives.

Another option looked like Rotaprecision Rodogrip series

http://www.rotaprecision.com/pages/rodogrip_dt_ansa.html

But they don't go big enough and I'm not convinced they're suitable - look like they may unevenly load the bearing when locked in place.

Another suggestion has been to go for one of the larger grub screw locking locknuts and drill and tap into the outside face of it. I can then get a locking plate made up to suit. I'd much rather find an off the shelf solution just in case there are repeats of this machine, or any similar.

Looking for M180 thread. Approximately 500mm deep inside a D344mm housing. The shaft runs through the housing also.

Any suggestions would be appreciated.

 

[unclesyd]

Here are two possible candidates for you application. We use both types, the Spieth and the Supernut product. i would give them a call with your specific requirements.

http://www.nord-lock.com/products/superbolt/nut-style-tensioners/standard-series/sj-compact/

 

[Machina]

Thanks unclesyd,

Nord-lock came back to me say they didn't have anything off the shelf but the Spieth range looks promising. We've ordered one and are waiting for it to turn up to try it but it' looks like it should do the job.

I got a price back for the Hiwin option and its was high, as expected, but not unacceptably so. But it was over-specced for this job and the Spieth one is cheaper...

 

[EdDanzer]

See if this will work.

http://www.danzcoinc.com/html/hlt_bearing_nuts.html

Ed Danzer

http://www.danzcoinc.com

http://www.dehyds.com

 

[Machina]

Ed,

That looks more like what I was thinking about. However it looks like we're going with the Spieth one for the time being; we'd ordered one of those and have made some design decisions based around them.

I'll keep a note of yours for future reference, thanks.