Go Back   RCCrawler Forums > Scale Rigs General Tech > 1.9 Scale Rigs
Loading

Notices

Thread: Silent Running. How to make it quiet.

Reply
 
LinkBack Thread Tools Display Modes
Old 05-21-2017, 09:58 AM   #1
Dbx
Quarry Creeper
 
Join Date: Mar 2016
Location: Midlands
Posts: 317
Default Silent Running. How to make it quiet.

So, my build is almost complete and looking great. The first few test runs under my belt. It's all good... but the noise is still bugging me. When out in the countryside the noise is really prominent (almost as prominent as my wife complaining about it)

I've made a few steps to make it the queitest rig i've seen run... but i'd like to do better. The spur and pinion seem to be the culprit.

I'm running a kit SCX10ii with a Holmes Hobbies Puller Pro 2700kv and a BLE controller.

I've swapped all the transmission gears out for Boom racing Helical gears (big step forward in noise) and have xtra speed helical spur and pinion. VP trans box, motor plate & axles, which all prob helps. All carefully put together to run as smooth as possible. The transmission gear pair and trans box trio seem smooth as silk.

Like i said, the spur and pinion seem to be main the source of noise. I was really particular in the assembly of the spur, machining a special slipper eliminator and using a clock guage to set the spur running as true as possible, but it doesn't seem to be any quieter that the stock 32dp setup.

So i fall upon the wisdom and experience of the forum. How can i make it quieter?



Dbx is offline   Reply With Quote
Sponsored Links
Old 05-21-2017, 10:04 AM   #2
I wanna be Dave
 
Join Date: Sep 2011
Location: Douglassville, PA
Posts: 4,218
Default Re: Silent Running. How to make it quiet.

Switch to a plastic spur for one. Metal ones are tougher, but generally tend to make more noise.
OSRC is offline   Reply With Quote
Old 05-21-2017, 10:14 AM   #3
Dbx
Quarry Creeper
 
Join Date: Mar 2016
Location: Midlands
Posts: 317
Default Re: Silent Running. How to make it quiet.

The xtra speed spur is delrin. I tried the boom racing steel spur. A quality gear, and i even tried lapping it in with valve paste - made it very smooth.. and still hilariously noisy.
Dbx is offline   Reply With Quote
Old 05-21-2017, 12:13 PM   #4
I wanna be Dave
 
Join Date: Sep 2006
Location: Anchorage, Alaska
Posts: 3,099
Default Re: Silent Running. How to make it quiet.

I'm not a big fan of helical or worm cut gears.
I utilize straight cut 48 pitch Axial steel gears incl. the trans./spur/pinion.
Even with utilizing a steel 48 p spur gear, I don't think mine produces excessively loud noise during operation.

Helical cut gears may engage more precisely due to their tooth meshing design and near constant tooth contact.
And that may offer slightly more precision and tooth strength if meshed properly.
But a by product will be more engagement friction and noise.

So it would be pertinent that the supporting rods and gears are shimmed with precise tolerance and do not allow for too much gear (side shift) load/friction during engagement.

Possibly the louder noise heard is due to these L & R side loads more so then the actual gear tooth engagement ?

Make sure the spur and pinion gear mesh is not too tight...
and that there is a minute amount of free play allowing the gear teeth less load surface pressure or friction during engagement.
Free play does not mean gear or rod shift L - R.

Losi's Night Crawler worm drive and spiral cut gears tend to be louder as well. So maybe these gear cuts share a commonality and produce more noise generally.
Tho' it seems these gear cuts are more exact... they tend to whine more loudly then straight cut gears.
Especially noticed when geared real low or using a small pinion gear.

Another's thoughts on the subject of helical Vs. straight cut gears.

Diagram illustrates the lateral side loads that will occur with helical cut gears along with the vertical loads associated with both helical and straight cut gears.

Straight cut gears vs helical | Automotive Thinker - Discussing the finer points of automobiles
TacoCrawler is offline   Reply With Quote
Old 05-21-2017, 01:38 PM   #5
Dbx
Quarry Creeper
 
Join Date: Mar 2016
Location: Midlands
Posts: 317
Default Re: Silent Running. How to make it quiet.

Thanks tacocrawler. Thanks for the link. Side loading is definitely one of the drawbacks of helical gears, but shouldnt make noise. Helical gears are much quieter than straight cut.
I have been reading a bit this afternoon. Seems like the motor speed is going to make it difficult. Any very high speed mechanical interface will stuggle with noise, and i'd suppose 50k rpm qualifies as high speed. At speed, any imperfections in the mesh will be an issue.
For that reason i've just bought some industrial grade machined helical delrin/steel gears. The delrin gear i have does not it appear to be machined (or at keast, not very well) Not sure how i'll get them to fit though!

Last edited by Dbx; 05-21-2017 at 02:08 PM.
Dbx is offline   Reply With Quote
Old 05-24-2017, 02:37 PM   #6
Dbx
Quarry Creeper
 
Join Date: Mar 2016
Location: Midlands
Posts: 317
Default Re: Silent Running. How to make it quiet.

Success!
I've spent the last couple of days trying and making different things to get the high quality machine cut gears to work. Happily i have access to a lathe an mill at work. Just when i started to think it was hopeless, i found a combination and setup that works. I'd guess it reduces the pinion noise by about two thirds! I'm super happy. The rig is really very quiet now, and i think if i did the job again i could get it even better... but those gears are mucho expensive, so i settle for how it now is.

Dbx is offline   Reply With Quote
Old 09-19-2017, 09:09 AM   #7
Rock Stacker
 
Join Date: Aug 2017
Location: UK
Posts: 99
Default Re: Silent Running. How to make it quiet.

Quote:
Originally Posted by Dbx View Post
Success!
I've spent the last couple of days trying and making different things to get the high quality machine cut gears to work. Happily i have access to a lathe an mill at work. Just when i started to think it was hopeless, i found a combination and setup that works. I'd guess it reduces the pinion noise by about two thirds! I'm super happy. The rig is really very quiet now, and i think if i did the job again i could get it even better... but those gears are mucho expensive, so i settle for how it now is.

Hi - sorry but I'm really interested in your solution for this but the image (I hate photo bucket for what they have done!) doesn't work - can you explain your solution in writing ?
55ovalcharlie is offline   Reply With Quote
Reply



Silent Running. How to make it quiet. - Similar Threads
Thread Thread Starter Forum Replies Last Post
Silent Panda's Bomber Silent Panda Axial RR10 Bomber 16 03-19-2016 09:37 AM
tekin fxr is silent fast540 Electronics 15 08-03-2012 09:24 AM
How do i make my scaler silent? Scx10guy General Scale Talk 20 02-11-2012 09:37 PM
Silent............SERVO....... Double J Electronics 99 02-11-2007 08:27 AM
how do I make a sevo keep running Skippy Electronics 0 12-13-2004 05:37 PM
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 07:22 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com