NST

[Mouldy]

Nice work Sam... Best brushed fw spinner i've ever seen for sure.

[sam_smith]

Cheers guys! Think i'll keep with the brushed motor again so can hopefully hang onto that title

Now the weapon motor is nearly finished i've got bored of that and moved onto something else....

New drives....

Figured with all the effort i'm going to put in to make some decent gearbox cases, might as well start with some reasonable quality motors and gears. There are quite a few Dewalt drills available on Ebay pri cheap.

Picked up two new 12v Dewalt drills (without battery or case or anything) for £25 each.

Work has started on some new housings

Keep forgetting to post pics in reverse order

[sam_smith]

Might as well get right upto date....

some more machining to fit the motor and planetary gear assy's
Will ditch the first stage of gearing which is used with the 1st gear on the drill to save space, weight and give a more suitable output speed. Luckily the second stage has the same size and pitch teeth (with just a wider face width) so the motor sun gear is compatible into stage 2 which is handy.

Something annoying I found out after buying these drills is that they have advanced timing so unless i can get into the brushes to amend (which isn't gonna happen cos the motors swaged together) looks like will have to add an idler gear to one of the gearboxes, or each side will always have different power and speeds.

ali housing down to 110 grams now from 250 ish as a solid block, will turn the middle portion down next to save some more weight.

[sam_smith]

Heres some of the progress from the weekend. Turning out to be very time consuming unit...
but taking shape well at least. More lightening and mounting holes drilled out.

[sam_smith]

and abit more progress mainly more lightening

[sam_smith]

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]

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

[sam_smith]

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]

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]

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.