Joined: 13 Jul 2008
Posts: 51
Location: Perth,Western Australia
WHY NOT?????? _________________ If you and your friend are being chased by a grizzly bear, don't worry about out-running the bear, just worry about out-running your friend
Tue Jul 15, 2008 8:32 pm
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
Hahah, because he did and the wheels slipped during a match. Untill you find grub screws you can leave them in. _________________ ( •_•)
Joined: 13 Jul 2008
Posts: 51
Location: Perth,Western Australia
whew you had me worried there! _________________ If you and your friend are being chased by a grizzly bear, don't worry about out-running the bear, just worry about out-running your friend
Tue Jul 15, 2008 8:45 pm
Giant Robo Experienced Roboteer
Joined: 17 Jun 2004
Posts: 583
Location: Marayong NSW
Before I found grub screws in stock at Bunnings I used to use long, 3/16" bolts and when happy with the fit, hacksaw them off flush. You can get away with two screws, fill all the holes or I generally go with four.
I like to tighten each screw in turn until there is just a little slippage of the ring gear between the peaks, then do them all up a quarter turn. Hope this helps.
Oh yeah, this is "without" any bearings left in!
Wed Jul 16, 2008 1:54 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
I fill all of the holes to stop dust getting into the gearbox. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Wed Jul 16, 2008 6:57 pm
skandia
Joined: 13 Jul 2008
Posts: 51
Location: Perth,Western Australia
transistor
i didnt wannna make another topic for this question so im just posting it here: i have the 18v DSE drill motor and my dad says it will burn out the motor if it doesnt have the power transistor. is this true? if so how can i add the transistor into the connections of my robot?
skandia _________________ If you and your friend are being chased by a grizzly bear, don't worry about out-running the bear, just worry about out-running your friend
Sun Jul 20, 2008 1:04 pm
andrew
Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
dont think so, all u need is bare motor/gearbox, grub screws to disable the gearbox and thats it really
some people have soldered a resistor or whatever its called across the motor connections to reduce motor interference to the radio gear but thats it really
Even if your running a half descent radio you dont even need to do that _________________ Andrew Welch, Team Unconventional Robotics
Sun Jul 20, 2008 1:10 pm
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
That would be a capacitor not resistor. Never done it and never had an issue.
The motor will run fine off the battery it came with, it's when you start trying to increase the voltage that it will overheat and you risk destroying it. _________________ ( •_•)
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Andrew meant capacitor, not resistor . A small ceramic cap of around .01uF soldered across the motor terminals can help reduce RF interference and increase the range of your radio control - there are pages & pages of stuff on this site and others about it. It will have the most benefit for 27 MHz radios and has not really been required for 2.4GHz SS radios. Since they cost just a few cents, you might as well include them.
On to the transistor: You don't generally need it; it is part of the speed control circuit in the drill's trigger mechanism and unless you were planning to make a variable speed servo speed controller with the drill triggers, its not going to be of any use.
Making a speed controller from the triggers sounds neat, but its harder than it looks and I can't recall anyone doing it. One thing you could try is to build a standard servo controller and leave the drill triggers wired in between the controller and the motor. You could then use the drill triggers as a rough speed limiter by keeping them depressed (say) 75%, which would only allow the motors to reach 75% of their top speed.
I don't think anyone has tried that either, but since it will cost nothing and isn't much extra work, why not?
Sun Jul 20, 2008 2:19 pm
kkeerroo Experienced Roboteer
Joined: 17 Jun 2004
Posts: 1459
Location: Brisbane
Andrew (totally_recycled) has made some very nice speed controllers a couple of years ago by using a servo to control the trigger and reversing switch. Seems a like it requires a fair bit of fine tuning to get them to work but the price is right. _________________ Get Some!!!
Secretary of the Queensland Robotics Sports Club inc.
Sun Jul 20, 2008 2:31 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Andrew also made a set with servo boards that drove fets and had relay reverse on them. _________________ https://www.halfdonethings.com/
Sun Jul 20, 2008 9:11 pm
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
And lets not forget the moulded uthrene trigger controls the planners came up with! _________________ ( •_•)
Joined: 13 Jul 2008
Posts: 51
Location: Perth,Western Australia
ok thanks guys im happy now
now i just gotta wait a two weeks before my dad will take me out and get the rest of the parts for doorstop _________________ If you and your friend are being chased by a grizzly bear, don't worry about out-running the bear, just worry about out-running your friend
Mon Jul 21, 2008 5:23 pm
Giant Robo Experienced Roboteer
Joined: 17 Jun 2004
Posts: 583
Location: Marayong NSW
Hey! Iv`e been using drill trigger controllers since Andrew A. taught me years ago. The last one was in Fork in Hell!
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