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Offset gear mesh how much? Help!?


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#1 Slot-Racer

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Posted 07 May 2018 - 01:57 PM

Greetings,

 

In setting up a new open motor, was curious how much of an offset gear mesh is too little to get away with? Should I go for a larger pinion or does this look appropriate? The spur is -2 deg and the pinion is straight. What do you think? 

 

Thank you.

 

Gear Mesh.jpg


Mario Damis




#2 Jason Holmes

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Posted 07 May 2018 - 03:17 PM

I would be looking for a 16deg spur gear. Is that a C can open motor?? 64P

 

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#3 Slot-Racer

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Posted 07 May 2018 - 03:23 PM

Thank you for your reply Jason, it's appreciated. Yes it's a C can with an Proslot Infinity armature in a Mega III can using 64 pitch gears. So a 16 deg. is better? Ok. I will see if I can find any on PCH. I happen to have a 9 tooth 2 deg pinion, would either be a better idea? The issue is that I can't move the motor in (back) anymore but I'm fearing with this open motor the gear mesh is not enough and may strip? At this time it was advised to run a 8/39 64 pitch by Proslot. What do you think?


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#4 Slot-Racer

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Posted 07 May 2018 - 05:09 PM

Ok. Well I removed the pinion and tried different combination. An 8 pinion (2 deg.) didn't help anymore than the straight 8 pinion with either a 38 or 39 2 deg or straight spur. What I tried is a 9 pinion (2 deg.) with a 39 (2 deg.) spur and now it's SO much better! But is this ratio too crazy? This better ratio/mesh is going to be 5.70 where as Proslot advised a 6.41 ratio initially? Is this a bad idea? 

 

The motor is a 30 Turn of 26 gauge wind.

 

Thank you. 


Mario Damis

#5 Zippity

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Posted 07 May 2018 - 10:43 PM

30 turns of 26 is not a C-can wind.  :(


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#6 Jason Holmes

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Posted 08 May 2018 - 10:25 AM

I would use 8/38 or 39 5deg pinion 16deg spur 64P 

 

jason


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#7 MSwiss

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Posted 08 May 2018 - 10:48 AM

S-707 Infinity replacement armature for PS-315 RTR 30 turns 26.
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#8 Slot-Racer

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Posted 08 May 2018 - 11:42 AM

Well, I got 9/39 to mesh way better. But it this too hot to run?

 

Mesh.jpg


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#9 Jason Holmes

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Posted 08 May 2018 - 11:46 AM

Yep, that's why you need an 8 or go to 72p. Try 9/43-44 angle on both gears.

 

jason


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#10 Slot-Racer

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Posted 08 May 2018 - 11:50 AM

So a 9/39 is too hot?


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#11 zipper

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Posted 08 May 2018 - 12:00 PM

Maybe, depends on track and grip. Done it sometimes on our King, Gr 12. Faster than 8/39 but tends to run hot. And timing must be considered, too.


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#12 Slot-Racer

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Posted 08 May 2018 - 12:10 PM

Maybe, depends on track and grip. Done it sometimes on our King, Gr 12. Faster than 8/39 but tends to run hot. And timing must be considered, too.

 

Ugh... OK. I don't know what the timing is if any. It's not specified by Pro Slot. Would then a 9/43 in 72 pitch be the right gearing and would not have to move the motor as Jason recommends? For 9/44 I find in 72 pitch, but the pinion is 5 -deg and the spur is -2 deg. Will this work? There is also a -16 deg spur. 


Mario Damis

#13 Zippity

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Posted 08 May 2018 - 02:20 PM

I read somewhere recently that a straight pinion with a 16° spur makes for an ideal mesh.

 

Just sayin'.  :)


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#14 Slot-Racer

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Posted 08 May 2018 - 02:47 PM

I read somewhere recently that a straight pinion with a 16° spur makes for an ideal mesh.

 

Just sayin'.  :)

 

Ok thank you! I'll get the 16° and the 2° deg  (just in case) to see which fits better. I'm assuming dimensional they will be like the 9/39 and I won't have to move the motor as it's in as far as it can go in there.  :laugh2:   


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#15 Jason Holmes

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Posted 08 May 2018 - 03:12 PM

That will work the 16 will will cover more of the Pinion

 

jason


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#16 Slot-Racer

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Posted 08 May 2018 - 03:26 PM

That will work the 16 will will cover more of the Pinion

 

jason

 

Awesome! Thank you for your help! 


Mario Damis

#17 Samiam

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Posted 08 May 2018 - 07:07 PM

 I'm assuming dimensional they will be like the 9/39 and I won't have to move the motor as it's in as far as it can go in there.  :laugh2:   

Is the magnet up against the axle? A small notch in the magnet usually has no affect on performance. 


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#18 Slot-Racer

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Posted 08 May 2018 - 07:09 PM

Is the magnet up against the axle? A small notch in the magnet usually has no affect on performance. 

 


Is the magnet up against the axle? A small notch in the magnet usually has no affect on performance. 

 

No not at all. What is, is the back of the can. It's completely flat against the motor box rear frame. I'll take a pic and post in a few min.

 

Rear 1.jpg

 

Rear 2.jpg

 

Top.jpg

 

Resized.jpg

 

 

 


Mario Damis

#19 gotboostedvr6

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Posted 09 May 2018 - 06:29 AM

Just get a *16 angled spur.
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#20 gotboostedvr6

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Posted 09 May 2018 - 06:36 AM

30 of 26? You need to shunt that motor. It's prob gonna blow up regardless. Ceramic mags and a wind that hot are not a good idea.
Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children's children what it was once like in the United States where men were free. - Ronald Regan #40 (1911 - 2004)

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#21 Jason Holmes

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Posted 09 May 2018 - 10:18 AM

David that is Mild back when I started we ran 20/25 most of the time in C cans and Yes they did run Hot and we shunted also 24 and Double winds and the cars weighted a ton but were Fun 

jason


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#22 Slot-Racer

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Posted 09 May 2018 - 11:55 AM

So is this motor going to blow up?  :shok:


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#23 B.C.

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Posted 09 May 2018 - 12:02 PM

I have several of these arms in c cans running at 13.8 unshunted

 

I have never smoked one. I believe all are at 8/39.

 

it is a nice milder wind for a c can. there was one of these on epay

 

in a pro slot rtr a month or so ago--someone scored a good buy.


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Brian C. Bays

#24 Slot-Racer

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Posted 09 May 2018 - 12:03 PM

I have several of these arms in c cans running at 13.8 unshunted

 

I have never smoked one. I believe all are at 8/39.

 

it is a nice milder wind for a c can. there was one of these on epay

 

in a pro slot rtr a month or so ago--someone scored a good buy.

 

Awesome post! Thank you!


Mario Damis

#25 gotboostedvr6

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Posted 09 May 2018 - 08:50 PM

We may have different ideas.

Ill assume that motor has mega 3 mags in it. They are one of the weaker mags on the market. If you have quads that improves your odds of not killing it.

I bet it will need a rebuild after 10 min of tracktime.
Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children's children what it was once like in the United States where men were free. - Ronald Regan #40 (1911 - 2004)

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