couple of questions

**suvv** · 4th January 2015, 18:13

thanks for that thankfully after some googling im only a 4 hour drive from whitwick so its not impossible for me to make an apperance.
please dont think less of me when i ask this but what is a set screw and are they easly obtained
harry you mentioned getting myself a set of taps for threads there appears to be about a million sets on ebay any sudgestion as to what isnt a waste of money or the wrong size
hate being a newbie

**harry hills** · 4th January 2015, 19:05

Ok for sure.
http://en.wikipedia.org/wiki/Set_screw Called grubscrews over here. To use them the way I meant they would be going on a shaft to transmit the motion.

On my hub here you can see a small screw that goes through the hub and presses down on the shaft when tightened. Because of this pressing down it moves when the shaft does. Its not a great method because (unlike in that image) you need to use a fairly large screw for the shaft diameter to get a decent result.

Its kinda simple when you think about it. For m5 bolts you need an m5 tap, for m4 bolts and m4 tap etc etc. M4 is a decent size for beetles I'd say without knowing too much about your design specifics. You'll need to drill a 3.5mm hole to tap for m4. You can use this or similar charts to know what kind of pilot holes you need to use for different threads: http://www.shender4.com/metric_thread_chart.htm

Taps are just an ebay search away, as are drill bits.

http://www.ebay.co.uk/itm/like/13076...f14=108&ff19=0

What kind of materials are you planning to work with can I ask?

**john_frizell** · 4th January 2015, 20:11

Giant Shark does a 2.4 GHz transmitter, with receiver, for Â£27. Works well for me.

**suvv** · 4th January 2015, 20:19

thanks for that grub screws make perfect sence to me as i have used them before diffrent name threw me totally im planing to work in hdpe mainly because i dont have metal work capabilities and i used to build rc model boats so am used to working with plastics though in a slightly thinner level though i think the principles remain the same i have been looking at a few videos of various beetleweights and saw a bot called anvil and i was wondering with it havving what looked like a fully screwed down metal body how did they access the removable link as the design i have in mind might end up having similar features all be it in plastic and i dont see how the link is accessable my only thought is that you can turn it over and it has no baseplate but i was under the impression that you had to disable it before touching it
excuse the essay lol

**harry hills** · 4th January 2015, 20:33

Alex kinda bent/broke the rules with regards to the link lol

**suvv** · 4th January 2015, 20:46

ok note to self dont copy anvil, i must admit my first bot aint gona be clever i just want it to work in the weight limit 1.5kg is not as much as i thought it was after doing some rough calculations as to what i think thinks are going to weigh in at

**Eventorizon** · 4th January 2015, 21:54

Originally Posted by harry hills

Alex kinda bent/broke the rules with regards to the link lol

Yeah, I bent them. Given it had no weapons I put the link on the underside of the machine where it was actually inside and pulled out using a cable tie. The machine was armed before the top was put on.

And this was all because I had no idea how the wiring would work and so I decided to work it out later. Anvil is now written off so don't worry about copying it.

**suvv** · 5th January 2015, 15:45

ok noted wont be doing that i have been reading the rules and trying to make sence of a few bits im used to using lipos from airsofting but would the rules allow me to place the whole bot in a charging bag/box or di i have to be able to remove the bateries