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| Bearing help needed |
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| BaronJ:
--- Quote from: Manxmodder on April 10, 2014, 07:25:51 PM --- --- Quote from: CHA5 on April 10, 2014, 05:04:25 PM ---It'll need to move in an arc of approx 30deg. It's just a thumb operated lever activating a brake MC, used infrequently with very little pressure applied. It needs to be a roller bearing for 'feel' rather than an engineering reason. --- End quote --- CHA5, I don't understand why you believe you will get better feel using a roller bearing than a plain low friction bush. I use ball bearings,roller bearings and plastic polymer bearings quite frequently on projects and I don't see anything within your application that would persuade me to fit a roller bearing. --- End quote --- I agree with Manxmodder ! If its just pushing a master cylinder rod, I assume that you will also be fitting a return spring, or are you trying to rely on the back pressure returning the lever to its normal position. |
| CHA5:
--- Quote from: Baron on April 11, 2014, 11:35:24 AM ---I assume that you will also be fitting a return spring, or are you trying to rely on the back pressure returning the lever to its normal position. --- End quote --- It doesn't need a separate return spring, there is a spring built into the MC. Hydraulic clutches & front brake MC's on motorcycles don't have separate return springs & they are only fitted to foot operated rear systems for construction & use regs'. The MC I'll be using is proven to not need any extra help on returning. I've been to a bearing shop today & picked up an assortment of roller & plain bronze bearings. They don't stock plastics in such small sizes so I'll order an assortment off the net. I'm happy to experiment & the device will certainly gets lots of real world abuse during R&D. This is the first time I've worked with bearings, I'm more interested in how to get the hole size right & how to keep it all working once it's all bolted up. Any help appreciated. |
| BaronJ:
Hi Cha5, When I'm machining a bore for a bearing I aim for a push fit with my fingers not with a press. The important thing is the finish on the bore. The last few tenths are polished using emery cloth. I usually go for a piece that is quite well used since its easy to introduce scratches with new stuff especially if its on the coarse side. The other thing that I note from your drawing for maximum rigidity the spindle wants to be as short as convenient. This will reduce the twisting moment on the bearing surfaces. |
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