Thread: bushing or not bushing

Originally Posted by hillpanther

hi everybody I m making woodworking jig and I always embedded Drymet bushing in moving parts.i used also hard chrome linear shaft.
here I m attaching 2 pictures for better understanding.do I need to embedded bush or just simply linear shaft is more than enough in aluminium which is 6063 grade.the maximum weight of total moving mechanism is including motor is 6kg.bush size is 6mm ID and 8mm OD and length is 12mm. your suggestion would be very important for me.

Snip

sorry in the picture there is no router motor

I am no expert with aluminium but I would say with an 8mm shaft supporting 6kg a bush would be the way to go.

Dean

Originally Posted by Oldneweng

I am no expert with aluminium but I would say with an 8mm shaft supporting 6kg a bush would be the way to go.

Dean

thanx for reply.i forget that 4 bush in 4 12mm thickness aluminum strip hold total 6kg weigh so each bush is almost 1250 gram weight.

Originally Posted by hillpanther

hi everybody I m making woodworking jig and I always embedded Drymet bushing in moving parts.i used also hard chrome linear shaft.
here I m attaching 2 pictures for better understanding.do I need to embedded bush or just simply linear shaft is more than enough in aluminium which is 6063 grade.the maximum weight of total moving mechanism is including motor is 6kg.bush size is 6mm ID and 8mm OD and length is 12mm. your suggestion would be very important for me.




sorry in the picture there is no router motor

Hi hillpanther,

If the mechanism is intended to be continuously movable then it might pay to use some needle bearings in there other than that your pictures look very
interesting ! I would like to learn more about what you are trying to do.

Regards:
BaronJ.

Hi Again,
I think I've spotted a potential problem. When you clamp the router/motor those arms are going to flex. That could cause some binding and stiffness of the pivot points. It may be be better to use a pressure plate and grub screws to secure the motor.

Regards:
BaronJ.

Originally Posted by BaronJ

Hi Again,
I think I've spotted a potential problem. When you clamp the router/motor those arms are going to flex. That could cause some binding and stiffness of the pivot points. It may be be better to use a pressure plate and grub screws to secure the motor.

Regards:
BaronJ.

Hi Baronj,
hillpanther has a couple of braces on either side of the clamps so hopefully that shouldn't be too much of a problem...hopefully
I'd go with the bushing as well

Phil

I would be bushing simply because over time I think that the holes in the Al would elongate and so the mechanism would get sloppy.
That device looks like a reduction pantograph - is it? It looks very nicely done regardless.

Michael

Originally Posted by Michael G

I would be bushing simply because over time I think that the holes in the Al would elongate and so the mechanism would get sloppy.
That device looks like a reduction pantograph - is it? It looks very nicely done regardless.

Michael

+1 on both points.

Rob

thank you very much for all your suggestion.
yes I m using 10mm hex with 6mm female thread spacer to keep them together so stiffness is no problem.
yes it's reduction pantograph.the bushing I m suing called drymet.i choose it for it's thin wall.there is no any fast movement so I didn't chose needle bearing.
OILES Drymet LF


here is the video of my earlier model so you can see how much it has maximum movement.
Quadro mortise and tenon joint - YouTube

Ahh, I see, very nice. I was wondering what the springs were for.

I would definitely stick with the bushings even if only for the torque while cutting the as aluminium would just become sloppy over time.

-Josh

thank you very much so now I have decided to stick with bushing as you all suggest.

Nice looking machine, very well made and looks like it does an excellent job especially, thanks for the video.

Regards
Ray

Originally Posted by RayG

Nice looking machine, very well made and looks like it does an excellent job especially, thanks for the video.

Regards
Ray

thanx for your words glad you like it.i m trying to make it more better with all your suggestions.

Aluminium on polished steel is a good bearing combination, but a bush is a quality point, that someone might appreciate when it comes to service it, many years later perhaps. It means a quick repair rather than a slow one.
Also, a sintered bush that is impregnated with lubricant will be cleaner, and not need to be oiled routinely.

Jordan

Its a very sleek unit, i like it. With the right templates there would be no end to what you could do. The only thing i might suggest is to use a spiral flute cutter though, in harder timbers the straight one will struggle unless you take it real slow.
Love to see a vid of MK2 when it is done.

Ew