Linear sliding shaft with bushing
Linear sliding shaft with bushing
(OP)
Colleagues,
I need advice about a linear sliding shaft with bushing. This is a type of thing I haven't designed before. The sole purpose of these shafts is to prevent rotation of one flat part against another. Both parts are flat plates, parallel to each-other. Plates are made of delrin. There are 3 parallel sliding shafts between them.
Shaft diameter: 4 to 6mm,
Travel: 25mm
Sliding is not too frequent: about 10 times per hour
Radial loads on the shafts are small
At the moment, I'm thinking of using a bushing like McMaster 7815K11 and shaft like McMaster 1257K113.
Is this a viable approach?
Is this an overkill? What are the arguments against just drilling a hole in a delrin part and calling that a bushing?
How would one secure the bushing? The bushing on McMaster has a small flange, and I can't drill mounting holes in it.
Sorry, if the description is inadequate. I can add more details; just ask.
Any suggestion, insight or reference is really appreciated!
- Nick
I need advice about a linear sliding shaft with bushing. This is a type of thing I haven't designed before. The sole purpose of these shafts is to prevent rotation of one flat part against another. Both parts are flat plates, parallel to each-other. Plates are made of delrin. There are 3 parallel sliding shafts between them.
Shaft diameter: 4 to 6mm,
Travel: 25mm
Sliding is not too frequent: about 10 times per hour
Radial loads on the shafts are small
At the moment, I'm thinking of using a bushing like McMaster 7815K11 and shaft like McMaster 1257K113.
Is this a viable approach?
Is this an overkill? What are the arguments against just drilling a hole in a delrin part and calling that a bushing?
How would one secure the bushing? The bushing on McMaster has a small flange, and I can't drill mounting holes in it.
Sorry, if the description is inadequate. I can add more details; just ask.
Any suggestion, insight or reference is really appreciated!
- Nick





RE: Linear sliding shaft with bushing
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For low duty speed and accuracy using Delrin on its own would be fine. I would bore all parts together to ensure concentricity and parallelism. I would make fixed bore as deep as possible (x4 dia) and clamp shafts in place. I would make shaft size as big as possible. 6mm sounds pretty small. Any bending and it wont work.