NST

[sam_smith]

Re: NST

Finally...

Need some decent button head bolts to finish it off and modify the shaft to suit sprockets. That'll prob just be a keyway and grub screw. Then can machine off the excess shaft.

[james...venom]

Re: NST

That's looking awesome sam, some inspiring work there mate!

[sam_smith]

Re: NST

Cheers James, Looking forward to hearing more about your new machine!
Its good to be able to work on this sort of thing at a relaxed pace rather than my usual trick of rushing before an event.

I'm relieved that the gearbox is working well now after some minor problems on its first test. Needed to make a couple of mods to the front plate and integrate 2 12mm bearings instead of the single one and a nylon insert. This should now run more efficiently with side loads on the shaft from the chain tension.

[sam_smith]

Re: NST

A bit more progress....

I've modified a pair of the excellent robo-challenge blue wheels. Now fitted with needle roller bearings and sprockets. Taken a gamble tapping into the plastic, some harsh testing of the drives will be needed to see if the threads are likely to hold!

A couple of wheel & chain tension mounts CNC'd from 3.2mm hardox.

[sam_smith]

Re: NST

Some good progress on the second gearbox housing.
This one will have a different front bearing housing including a pair of idler gears to correct the forward direction of the motor on one side.

[Mouldy]

Re: NST

looking good Sam, pretty heavy duty chain tensioners! lol

You say idler gears... you mean one gear on the output of the gearbox running against a second to reverse the direction of the output? Nice work so far though mate. Get a picture of them in the machine

[sam_smith]

Re: NST

Cheers dude, its getting there slowly..

Yep thats exactly it. I've ordered the bearings and gears and drawn up a design. But it involves alot of effort and adds weight and i'm starting to feel that i can't be bother to make it now.... as looking more carefully at the motor again, it might be easier to butcher it to fetch the timing back after all.... even if it means remaking the back of the motor.

shouldn't be too long till their ready to install....hopefully

[sam_smith]

Re: NST

Decided to go on with the idler gearbox design and keep the motors standard.

Got on the CAD to design this one, then wrote 3 pages of G-code for the machine. Spent way too many hours on this...... but it does look quite cool and shaved most of the grams off possible.

Theres just one more plate/cover which needs machining to go on top with the other bearing supports.

[harry hills]

Re: NST

wow!

[sam_smith]

Re: NST

Lol cheers Harry.

Some more progress over the last few days....

Finished the outer bearing support for the idler gearbox. Machined ti shaft, fitted spockets and keywayed both gears on.

As it turned out the 'cover plate' took as long to make as the housing itself but turned out quite well.

[sam_smith]

Re: NST

Assembly in the chassis at last..... with the chains fitted and gearboxes bolted down.

This shows the aluminium inner wheel mounts too. Also the now pocketed triangular part of the baseplate.

[harry hills]

Re: NST

how is it posible for it to look sooo good?

[typhoon_driver]

Re: NST

Time, patience and a CNC mill

[Mouldy]

Re: NST

Looking epic mate

[jonny]

Re: NST

AWESOME :shock: