Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Ok Cool Ill track some 5mm grub screws down
Thanks
Miles
Sat Jul 03, 2010 11:37 pm
andrew
Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
go to bunnings
itll cost u about 2-2 1/2 $ and they come in packs of 5 i think so two packs will suffice for a pair of drills _________________ Andrew Welch, Team Unconventional Robotics
Sun Jul 04, 2010 9:27 am
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
If all else fails bolt.com.au sell every type of fastener you could ever want, but make it worthwhile the postage is $13 regardless of order size. _________________ ( •_•)
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Ok got everything happening now just have to do the grub screws. I'll get em tomorrow from either nuts & boltz in ip or Coventry fasteners at wacol. Our bunnings had both sizes of washers and the wheels. But the only grub screws was a multi pack of different sizes.
Thanks
miles
Sun Jul 04, 2010 6:39 pm
Jaemus Experienced Roboteer
Joined: 01 Apr 2009
Posts: 2674
Location: NSW
i got em from bunnings just the other day
look at the section with all the high-tensile and stainless blister packets of bolts
Sun Jul 04, 2010 10:00 pm
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Hi guys
managed to track the grub screws down at Blackwoods in ip (17 cents each).
Yeah the Booval Bunnings is at the end of our street ,which is handy as, but it seems to be a bit smaller than other bunnings' so i'm not surprised they didn't have the same grub screws as other bigger stores.
I installed the screws so that they just touch the spinning bit underneath. So if there is still a bit of wheel slippage i need to screw them down a tad..right?
Thanks
Miles
Tue Jul 06, 2010 9:25 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
just put two in opposite each other and tighten it down just enough so that theres no real slack on the output shaft (with a wheel attached) before the motor starts to turn.
any more then that and it'll bind the gearbox up, not enough and theres going to be a mountain of slack in the gearbox which makes it hard to drive etc. then place another two in afterwards (should have 4 at 90 degrees to each other ) _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Tue Jul 06, 2010 9:32 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
You may wish to fill all of the holes to keep out dust. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Wed Jul 07, 2010 7:16 am
andrew
Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
Nah. Only 4 is needed. Any more is just a waste. Dust hasn't caused issues yet and worst case cover em with tape. _________________ Andrew Welch, Team Unconventional Robotics
Wed Jul 07, 2010 9:21 am
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Hi guys so when I spin the wheel by hand in either direction, should I hear any clicking of the grub screws on the spinning part of the motor? Or wind them out till its silent?
Thanks
miles
So if you have opened up a motor there is small bumps on the external metal ring which stops it spinning. General rule of thumb is to tighten each screw until it binds then back it off just enough so it can slide back and forth between two bumps. Then repeat this for all the screws.
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
The output shaft of the motor should have no resistance for about 10 degrees or so, then a click noise when the grub screw hits the collar and the motor turns. _________________ They say that he crossed the fine line, from insanity to genius.
Thu Jul 08, 2010 2:24 pm
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Hi guys we got it all working now. Those grub screws work great. We even connected up some long wires to the drill triggers and had a go driving our robot around powered by the drill battery. Now we are just wondering if we could use two cheap speed controllers from radio controlled cars, to run it? two of these maybe. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=2163
That would be a cheap way to get it up and rolling. But does this work? Would it plug into a spektrum receiver?
Thu Jul 08, 2010 7:47 pm
andrew
Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
nah, thems be brushless speed controllers
you rnt running brushless drives so thed be no good
cheapest option would be sabretooth 25 amp
scorpion xxl or them misc blue controllers sold on ebay but there only limited to around 14 volts _________________ Andrew Welch, Team Unconventional Robotics
Thu Jul 08, 2010 7:53 pm
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Ok Thanks Andrew ...Now I know why no one else has suggested this. Will save for a Sabertooth.
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