Search found 48 matches

by microwavesafe
Fri Feb 22, 2013 12:17 pm
Forum: Design Ideas
Topic: Other v wheels
Replies: 16
Views: 3463

Re: Other v wheels

Unless you could get hold of something like this in the right size

http://www.cnbearing.info/en/type/76.htm
by microwavesafe
Fri Feb 22, 2013 11:08 am
Forum: Design Ideas
Topic: Other v wheels
Replies: 16
Views: 3463

Re: Other v wheels

Ah yes! The same issue with the existing bearings. The only really good solution I can see is what I've gone for in the RM1ZZ type bearing with the V groove built into the outer race. The only problem with them is the steel issue. and them being a different diameter. The performance however is very ...
by microwavesafe
Fri Feb 22, 2013 8:28 am
Forum: Design Ideas
Topic: Other v wheels
Replies: 16
Views: 3463

Re: Other v wheels

I think the problem lies in mechanically coupling the groove to the bearings. I believe the weakness of the design is having to machine a shim that exactly matches the inner ridge of the delrin v wheel. So how about we get rid of the internal ridge altogether and we use flanged bearings to clamp the...
by microwavesafe
Thu Feb 21, 2013 3:54 pm
Forum: Design Ideas
Topic: Other v wheels
Replies: 16
Views: 3463

Re: Other v wheels

I don't think the stiffness / strength of the material used is really the issue. For me the issue is with how the bearings sit inside the wheel. If you could manufacture a delrin wheel with the bearings inside (like the RM1ZZ type http://www.vxb.com/page/bearings/PROD/Kit8351) I think they would wor...
by microwavesafe
Mon Feb 18, 2013 5:11 pm
Forum: Design Ideas
Topic: Hall effect home switch
Replies: 3
Views: 2629

Re: Hall effect home switch

I've been meaning to fit homing switches for a while now and these look perfect.

Can I ask what type of magnets you used and where you placed them?
by microwavesafe
Thu Feb 14, 2013 10:19 am
Forum: Design Ideas
Topic: X and Z mods
Replies: 30
Views: 9362

Re: X and Z mods

I've now fitted two 50mm spacers at the bottom of the X axis. Bottom bracing 1.jpg Unfortunately the local fastenings trade counter didn't have any 50mm M5 threaded in stock. So i've ended up with some aluminium tubing cut to size and bolted through with M5 75mm socket cap screws. This has again imp...
by microwavesafe
Tue Feb 12, 2013 1:27 pm
Forum: Design Ideas
Topic: X and Z mods
Replies: 30
Views: 9362

Re: X and Z mods

I also want to say that before the mod a small force could flex the Z axis, with the mod I have to push quite hard before it even starts to move, so hopefully the cut wont exert this much force and the Z axis will remain constant. I just wanted to quantify the results a bit, as simply stating the ma...
by microwavesafe
Tue Feb 12, 2013 11:29 am
Forum: Design Ideas
Topic: X and Z mods
Replies: 30
Views: 9362

Re: X and Z mods

Ah measuring you say! I didn't do anything other than laying down a ruler, but before the mod I could get 2 to 3 mm flex at the end of the cutter at maximum extension. There seemed to be a point where the bearings inside the V wheels on the X axis would 'click' and give another mm or so. I believe t...
by microwavesafe
Mon Feb 11, 2013 8:08 pm
Forum: Design Ideas
Topic: X and Z mods
Replies: 30
Views: 9362

Re: X and Z mods

@improbable I put a bolt through all the spare holes as well so the plates couldn't flex much. It did help, with the strong coupling to the steel plate. I've thought of a better idea while I was writing this up though. The main bowing point is between the two spacers, there are two 5mm holes at the ...
by microwavesafe
Mon Feb 11, 2013 5:46 pm
Forum: Design Ideas
Topic: X and Z mods
Replies: 30
Views: 9362

Re: X and Z mods

With all these mods in place the Z axis flex at the cutter is massively reduced. I can post hole placement information if anyone is interested. I'd quite like to use the new set up to cut a new Z axis plate as I believe I will get more strength out of a single piece of 6mm aluminium, as opposed to t...