Parts for hand ergometer (exercise bike)

[JAZZCNC]

Prefer the tube approach as less inertia as well.

Whats your view on 1 v 2 clamp bolts?

Personally I'd have gone for solid and let me take the weight out of it by boring.!

Regards clamps bolts then probably 2 has it will clamp more even. How many bearings are you planning on using.?
Also the specs for 6900zz are 22x10x6 and if this is being assembled like I think (see pics) then you have allowed for 2 bearings @8mm is this correct.?
See pic6 and you'll see what I mean with 6mm bearing and 4mm spacer between, it leaves shaft sticking out.!

Let me know if I'm wrong and if this is the final drawing.

cheers
Dean.

[irving2008]

Dean,

If you prefer to machine from solid and dont mind the wastage feel free I went for the lowest cost approach.

When you say 'shaft sticking out' I assume you mean the inner end of the axle? Thats why there are 2 spacers, the second goes on the end of the axle and a standard M8 nyloc nut & washer bears against it. I did it this way as in the past i found a M8 nut is too large and fouls the bearing outer race (da max for bearing 12mm, A/C for nut is 15mm) and turning an M8 washer down to 12mm is fiddly.

But if you have a better solution....

[JAZZCNC]

Dean,

If you prefer to machine from solid and dont mind the wastage feel free I went for the lowest cost approach.

Ok will do not a problem just small delay on material, which I've sorted. I Should have material for weekend so will do it then.

Thats why there are 2 spacers,

Ah ah my mistake didn't see x 2. . . . Lol . . . . Thou think it better to space the bearings far apart has possible so I'd be inclined to make a washer, so I'll do that if you don't mind. I'll make wider spacer and turn a washer down, turning washer down is easy enough so no problem.

Like this.

[irving2008]

That works for me!

Those renderings are great, really helps to visualise things. What are you using? Sadly there's nothing that runs on Android that does that.

I'll post other drawings tomorrow, need to review them to see if I can simplify them.

[mekanik]

[QUOTE=irving2008;47875]That works for me!

Those renderings are great, really helps to visualise things. What are you using?

second that jazz, very impressive.

[JAZZCNC]

That works for me!

Those renderings are great, really helps to visualise things. What are you using? Sadly there's nothing that runs on Android that does that.

Yes 3D models are great for showing visually unfortunately software to do this quickly and easy is not cheap. These are done with Solid works and it's bloody expensive fortunately I have it thru business so effectively tax mans bought it or should say not getting it. . .Lol

[JAZZCNC]

Hi Irving,

Nearly done mate had loads of problems with Lathe and my dosy mate bring me wrong stuff.!! . . . But here's a couple of pics to wet your appetite. Just got flats to put on pin and whip crank up on CNC machine then done.



Cheers
Dean.

[Clive S]

Very nice Dean, how did you do the split to make the clamp bit? ..Clive