Brushless motor mount holes

New school stuff: brushless, lipo, spectrum, etc...

Moderator: scr8p

Post Reply
Peter_B
Regular Member
Posts: 86
Joined: Mon Sep 04, 2017 1:16 pm

Brushless motor mount holes

Post by Peter_B » Wed Dec 13, 2017 4:59 pm

I've just come to install a brushless motor, in my RC10 Team Car, only to find that the mounting holes on the motor are slightly too far apart for the holes on the RC10 motor plate.

The motor is a Reedy Sonic 540 M3 #269. I bought it nearly new from eBay.

An old brushed motor fits without issue.

Do I need a different motor plate - from the World's re-re for example?

User avatar
NomadRacer
Super Member
Posts: 670
Joined: Sun Apr 16, 2017 11:29 am
Location: Eastern Shore of Virginia

Re: Brushless motor mount holes

Post by NomadRacer » Wed Dec 13, 2017 5:36 pm

There's no different motor plate that I know of. I use the Reedy M3 series (17.5T) in a couple of black re-release motor plates and had to work on the top slot with a small file. I don't touch the bottom hole. I'm guessing the gold motor plate will be the same.
Bum on Direct Deposit

User avatar
jwscab
Approved Member
Posts: 5578
Joined: Wed Jan 28, 2009 2:42 pm
Location: Chalfont, PA

Re: Brushless motor mount holes

Post by jwscab » Wed Dec 13, 2017 5:52 pm

yeah, i think i had to hit the top slot with a file just a little. maybe half a mm at most. probably a standard to metric conversion or something that makes it slightly off.

Peter_B
Regular Member
Posts: 86
Joined: Mon Sep 04, 2017 1:16 pm

Re: Brushless motor mount holes

Post by Peter_B » Wed Dec 13, 2017 6:18 pm

NomadRacer wrote:
Wed Dec 13, 2017 5:36 pm
There's no different motor plate that I know of. I use the Reedy M3 series (17.5T) in a couple of black re-release motor plates and had to work on the top slot with a small file. I don't touch the bottom hole. I'm guessing the gold motor plate will be the same.
Any idea what sort of file I need? I don't currently have any at all.
jwscab wrote:
Wed Dec 13, 2017 5:52 pm
yeah, i think i had to hit the top slot with a file just a little. maybe half a mm at most. probably a standard to metric conversion or something that makes it slightly off.
Yeah it doesn't seem to be far out. But it's enough to stop the screws going in.

User avatar
Coelacanth
Approved Member
Posts: 7376
Joined: Thu Jul 29, 2010 10:20 pm
Location: Alberta, Canada

Re: Brushless motor mount holes

Post by Coelacanth » Wed Dec 13, 2017 6:30 pm

Peter_B wrote:
Wed Dec 13, 2017 6:18 pm
NomadRacer wrote:
Wed Dec 13, 2017 5:36 pm
There's no different motor plate that I know of. I use the Reedy M3 series (17.5T) in a couple of black re-release motor plates and had to work on the top slot with a small file. I don't touch the bottom hole. I'm guessing the gold motor plate will be the same.
Any idea what sort of file I need? I don't currently have any at all.
You need a round rat tail file. It's basically a thin, round file that you use to either widen or extend a hole. They come in many thicknesses with (usually) a tapered tip. The're pretty cheap and you can buy them in sets with different diameters, or with some flat, round, triangular, etc. shapes.

Capture.JPG
Last edited by Coelacanth on Wed Dec 13, 2017 6:33 pm, edited 1 time in total.
Completed projects: CYANide | Zebra Optima | Barney | OptiMutt
Current projects: 'Red Tide' Lucas Agitator

User avatar
jwscab
Approved Member
Posts: 5578
Joined: Wed Jan 28, 2009 2:42 pm
Location: Chalfont, PA

Re: Brushless motor mount holes

Post by jwscab » Wed Dec 13, 2017 6:33 pm

https://www.amazon.com/SE-7382NF-Premiu ... MQ9D1FHP3V

lots of sets of these type around. very handle for many things, not just hobby.

Peter_B
Regular Member
Posts: 86
Joined: Mon Sep 04, 2017 1:16 pm

Re: Brushless motor mount holes

Post by Peter_B » Wed Dec 13, 2017 6:36 pm

Do these look like they'll do the job?

http://www.diy.com/departments/mac-all ... 440_BQ.prd

Timmahhh
Approved Member
Posts: 159
Joined: Tue Feb 07, 2012 6:57 pm
Location: IL

Re: Brushless motor mount holes

Post by Timmahhh » Wed Dec 13, 2017 6:37 pm

Double check to make sure that the motor doesn't have different spacing for different pairs of holes. Sometimes they vary in spacing around the face plate of the motor.

Peter_B
Regular Member
Posts: 86
Joined: Mon Sep 04, 2017 1:16 pm

Re: Brushless motor mount holes

Post by Peter_B » Wed Dec 13, 2017 6:42 pm

Timmahhh wrote:
Wed Dec 13, 2017 6:37 pm
Double check to make sure that the motor doesn't have different spacing for different pairs of holes. Sometimes they vary in spacing around the face plate of the motor.
Checked that. All have the same problem.

User avatar
GoMachV
Moderator
Posts: 9522
Joined: Mon Apr 30, 2012 2:31 am
Location: Portland, Oregon
Contact:

Re: Brushless motor mount holes

Post by GoMachV » Wed Dec 13, 2017 6:43 pm

I had someone with the same issue on a Lethal Weapon motor plate. Apparently some motors are out of spec these days.
My Garage < RC Car Action scans, manuals, and other fun stuff
Direct link to manuals and documents
Factory Works website

Peter_B
Regular Member
Posts: 86
Joined: Mon Sep 04, 2017 1:16 pm

Re: Brushless motor mount holes

Post by Peter_B » Thu Dec 14, 2017 12:37 pm

I picked up a set of needle files and solved the motor fitment issue.

Thanks for the pointers

User avatar
Lonestar
Approved Member
Posts: 3949
Joined: Wed Dec 12, 2007 10:17 am
Location: Switzerland, yannow, in Europe (or almost)

Re: Brushless motor mount holes

Post by Lonestar » Thu Dec 14, 2017 12:51 pm

GoMachV wrote:
Wed Dec 13, 2017 6:43 pm
I had someone with the same issue on a Lethal Weapon motor plate. Apparently some motors are out of spec these days.
This is weird :shock:

Never encountered the issue so far, but good to know!
AE RC10 - Made In The Eighties, Loved By The Ladies.

User avatar
RC10th
Approved Member
Posts: 2772
Joined: Sat Feb 16, 2013 2:51 pm
Location: Australia

Re: Brushless motor mount holes

Post by RC10th » Thu Dec 14, 2017 1:51 pm

I think the issue is with the old motor plates as brushed motors had a pair of holes side by side which were each slightly off center. The RC10/T motor plate had a fixed lower mounting hole so the motor has to rotate instead of slide to adjust mesh. Modern brushless motors have single holes dead center so the adjusting arc is different.
I was old school - when old school wasn't cool !

User avatar
Lonestar
Approved Member
Posts: 3949
Joined: Wed Dec 12, 2007 10:17 am
Location: Switzerland, yannow, in Europe (or almost)

Re: Brushless motor mount holes

Post by Lonestar » Thu Dec 14, 2017 2:38 pm

RC10th wrote:
Thu Dec 14, 2017 1:51 pm
I think the issue is with the old motor plates as brushed motors had a pair of holes side by side which were each slightly off center. The RC10/T motor plate had a fixed lower mounting hole so the motor has to rotate instead of slide to adjust mesh. Modern brushless motors have single holes dead center so the adjusting arc is different.
I believe we were supposed to use opposite holes when running brushed mills back then already ;)
AE RC10 - Made In The Eighties, Loved By The Ladies.

Post Reply

Return to “R/C Tech Forum”

Users browsing this forum: No registered users and 2 guests