icebeaver Posted January 23, 2015 Share Posted January 23, 2015 (edited) Does anybody know how to stop cogging, I've recently swapped my son's brushed motor for a hobbyking brushless combo. It runs fine once it's moving but when starting 0-2mph there is a horrible noise. After googling I found this is probably (cogging effect) but no mention how to stop it. Any ideas? Thanks Edited January 23, 2015 by icebeaver Quote Link to comment Share on other sites More sharing options...
Saabmania2 Posted January 23, 2015 Share Posted January 23, 2015 You can't actually stop it, best you can do is to turn the punch down with the programme card 1 Quote Link to comment Share on other sites More sharing options...
Luke B Posted January 23, 2015 Share Posted January 23, 2015 Try taking the gearing down a bit. Buy some new pinion gears with fewer teeth and see which one gives the best compromise between cogging and top speed. Quote Link to comment Share on other sites More sharing options...
icebeaver Posted January 23, 2015 Author Share Posted January 23, 2015 Is the (punch) acceloration of so it's on minimum Quote Link to comment Share on other sites More sharing options...
icebeaver Posted January 23, 2015 Author Share Posted January 23, 2015 Luke I changed the stock 22 to 17 with no difference. Quote Link to comment Share on other sites More sharing options...
Luke B Posted January 23, 2015 Share Posted January 23, 2015 OK, I would have expected that to make some difference. Can you change the settings for motor timing? I've never fully understood it but you could play around with different timing and see what happens I suppose. Other than that, I'm not sure there's much you can do. One of my cars has been cogging ever since I converted it to brushless, I even bought a different motor with more torque and it still does it a bit. 2 Quote Link to comment Share on other sites More sharing options...
icebeaver Posted January 23, 2015 Author Share Posted January 23, 2015 Thanks for that Luke, yes it does have motor timing low, normal, high, and is currently set on normal. I will give it a try and see what happens. Cheers Quote Link to comment Share on other sites More sharing options...
Noj Posted January 23, 2015 Share Posted January 23, 2015 Common with unsensored systems. Providing your mesh is correct, live with it and give quick, full trigger pulls to avoid it 2 Quote Link to comment Share on other sites More sharing options...
Luke B Posted January 23, 2015 Share Posted January 23, 2015 No problem. Don't know if it will help or not but it's worth a try. Quote Link to comment Share on other sites More sharing options...
Saabmania2 Posted January 23, 2015 Share Posted January 23, 2015 Common with unsensored systems. Providing your mesh is correct, live with it and give quick, full trigger pulls to avoid it Listen to this man what he don't know about RC's isn't worth writing down 2 Quote Link to comment Share on other sites More sharing options...
icebeaver Posted January 23, 2015 Author Share Posted January 23, 2015 Cheers guys Tried all setting and still happening. If it cant be helped it's not the end of the world. Thanks Quote Link to comment Share on other sites More sharing options...
Tomlad Posted January 23, 2015 Share Posted January 23, 2015 I also bought a brushless combo from hobby king about 3 weeks ago and mine has this noise. I just thought that's what it sounds like. I Thought it didn't sound right but meshing is fine and it runs great so didn't put any more thought in to it. Quote Link to comment Share on other sites More sharing options...
NuttyProfessor Posted January 23, 2015 Share Posted January 23, 2015 Is it a clunk as you take off or a squeal? Quote Link to comment Share on other sites More sharing options...
big turbo Posted January 23, 2015 Share Posted January 23, 2015 1 Lower the gearing 2 Reduce motor timing 3 Higher punch setting 4 Better c ratting battery's if using lipo, or switch to lipo if using nimh battery's Is pretty much all you can do to help. other than that fitting a sensord bl system is the only way to eliminate the problem so the rotor knows exactly where it is at all times. Quote Link to comment Share on other sites More sharing options...
icebeaver Posted January 24, 2015 Author Share Posted January 24, 2015 (edited) It's neither really nutty professor just a grinding noise like the gears aren't meshed (but they are). I will try these things you mention big turbo. After taking my lad to the park with it today all 3 7.2v nimh batterys got so hot I could barely hold them after changes. Is that normal? I have ordered a temp gun Edited January 24, 2015 by icebeaver Quote Link to comment Share on other sites More sharing options...
Noj Posted January 24, 2015 Share Posted January 24, 2015 NiMH packs? There's the issue. The fact they are getting too hot suggests that you're geared too high for them, as in, the motor is drawing more current than the packs can supply. Drop two teeth on the pinny, run again, checking temps every few minutes. Then go buy some lipos Quote Link to comment Share on other sites More sharing options...
icebeaver Posted January 24, 2015 Author Share Posted January 24, 2015 Nooooooooooo My wife's going to kill me, I just bought these batteries. But thanks for the advice noj, I've seen some pretty cheap turnigy 5000 30c for Quote Link to comment Share on other sites More sharing options...
Noj Posted January 24, 2015 Share Posted January 24, 2015 150a packs, they should be lovely (5ah x 30c) Quote Link to comment Share on other sites More sharing options...
Luke B Posted January 24, 2015 Share Posted January 24, 2015 Agreed. Brushless systems are never as good as they can be when running on NiMH. 1 Quote Link to comment Share on other sites More sharing options...
big turbo Posted January 24, 2015 Share Posted January 24, 2015 Yes as said that's the problem the nimh packs can not handle/cope with the discharge rate/amps that the motor is trying to pull, and hence why the packs are getting very hot. Gear down a few teeth on the pinny, lower the motor timing to 0deg and drop the punch right down is all you can do for now unless you go lipo. Def look into getting some lipos but read up first how to look after them, charge etc.. You will get better run times, more torque and top speed too it's a win win all round. Just don't tell the missus ;-) then sell the nimh packs on. 1 Quote Link to comment Share on other sites More sharing options...
Tug Posted January 25, 2015 Share Posted January 25, 2015 In case no-one has mentioned, ditch the nimh and go lipo! Read up on them first, it's vital you have a basic understanding of the chemistry and how to care for it. There's a dedicated lipo thread, read it. Any questions, come back and ask! Tell the Mrs to stop buying shoes, handbags and belts and that she looks fine in all the clobber she's already got! 1 Quote Link to comment Share on other sites More sharing options...
Noj Posted January 25, 2015 Share Posted January 25, 2015 In case no-one has mentioned, ditch the nimh and go lipo! Wakey, wakey Mr Tug Quote Link to comment Share on other sites More sharing options...
Tug Posted January 25, 2015 Share Posted January 25, 2015 Wakey, wakey Mr Tug Twas a joke! Crazy fool! Quote Link to comment Share on other sites More sharing options...
Noj Posted January 25, 2015 Share Posted January 25, 2015 Oops! Quote Link to comment Share on other sites More sharing options...
icebeaver Posted February 5, 2015 Author Share Posted February 5, 2015 Just to say thanks, I bought lipos and the cogging has virtually gone, the batteries don't get hot and the buggy is a lot faster. Seems the nimh packs just could provide the power. Thanks everyone 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.