brushless 1/5 4wd conversion about to begin! couple questions. - RC-Monster Forums

zeropointbug · 08.11.2009, 02:56 PM

Beautiful, simply beautiful.

I am anxious to see this thing running, and on some jumps too!

KaztheMinotaur · 08.11.2009, 09:39 PM

My pinion came with out a set screw also. I will have to call them tomorrow.

Ryu James · 08.11.2009, 10:01 PM

Quote:

Originally Posted by KaztheMinotaur

My pinion came with out a set screw also. I will have to call them tomorrow.

yeah i have already gone through calling them and jumping through hoops. just to save you some time what you need to do is email Deloris Miller at dmiller@sdp-si.com and explain what happened. give her part # and order #. i just got a reply form her today saying the engineer or something is checking things further. hopefully they will just get me another gear sent, even though i have already tapped the gear they sent now.

KaztheMinotaur · 07:29 AM

This sucks. They changed their web site. The hub & set screw option isn't offered now. I hope they changed it in the last day or so since you contacted them.

How deep of a hole did you have machined out of the gear? I think it needs to be 4mm deep to have enough of the shaft sticking out the other side to fit on the bearing.

I'm going to a machine shop this morning.

What size set screw did you use in the pinion?

KaztheMinotaur · 08.12.2009, 09:15 AM

I think we are going to be SOL...

Her reply to my email was that the website "had" and error and has since been corrected.

Ryu James · 08.12.2009, 10:08 AM

Quote:

Originally Posted by KaztheMinotaur

I think we are going to be SOL...

Her reply to my email was that the website "had" and error and has since been corrected.

hmm, initial reply i got was engineer was checking and now havent heard back still. but if she said that i agree. just have to drill and tap your self like i did i guess. mine turned out fine. doesnt look factory but it will work. and actually it is soooo close a fit with the 12/40 that i think i am gonna end up using like 15/40 instead. i hope temps are ok this route.

KaztheMinotaur · 10:22 AM

Machine shop quoted $35 for the work and I can pick it up at 11:00 AM tomorrow. I will have to call them back and tell them 6mm deep and to countersink the screw holes on the non milled side.

I am having machine shop drill & tap the pinion also. My last attempt at tapping didn't go well...although I think that the piece was already hardned and that is why it didn't work.

He also agreed that I should harden at least the pinion. I will probably do both though. He recomended oil instead of water to quench in.

Ryu James · 08.12.2009, 10:03 AM

Quote:

Originally Posted by KaztheMinotaur

This sucks. They changed their web site. The hub & set screw option isn't offered now. I hope they changed it in the last day or so since you contacted them.

How deep of a hole did you have machined out of the gear? I think it needs to be 4mm deep to have enough of the shaft sticking out the other side to fit on the bearing.

I'm going to a machine shop this morning.

What size set screw did you use in the pinion?

i had 6mm machined out of the spur gear. 6mm is ideal cuz it allows the shaft to protrude far enough through to sinc up to the bearing right but also leaves 1mm of space between gear and bearing so it freely spins. 6mm worked perfect imo. you could go 7mm and then have 3mm thickness which is same as stock and then take off 1-2mm of the entire gear so the gear is only like 8mm thick instead of 10mm. this would shed weight but cost more.

as for the pinion i used a 6mm set screw. if your machinist is like mine and doesnt have metric stuff tell him to drill a 3/16" hole in the pinion for a set screw and then the 6mm tap works perfect.

i have been using this guide for my own tapping and drilling. your machinist will have the same type of chart.
http://www.imperialinc.com/pdf/I_Tap&DieChart.pdf