Help, need motor couplers...

[ScarabChris]

The couplers at FineDesign come in 8mm and 10mm.

[befu]

yeah, not easy to make, especially considering they have to spin at 30k!

two options, make a busing to go from 6mm up to 10mm

Or just go with a set screw coupler

Or wait and buy the collet coupler when they are restocked. (prefered) this is the third of two options....

The 6mm is smaller than the 1/4" broach hole, or the pilot on a 1/4" broach.

Mark, still like your avatar. Thought about the gatling gun at one time, but I ended up going the belt fed route instead. If it ain't belt fed, it's still hungry!

Brian

[ScarabChris]

How do the set screw couplers hold up? I'm sure I would have to make a flat spot on the flex shaft so the set screws would have something to jam on.

I'm not sure how long I want to wait. Thing is I really can't do much without them, I would be stopped at the stuffing tubes. I can't make motor mounts or install the tubes without knowing exactly where the flex shaft will stop.

I also thought about just ordering the 8mm or 10mm square ends from FD and hoping I can come up with a bushing.

[FloatDaBoat]

I also thought about just ordering the 8mm or 10mm square ends from FD and hoping I can come up with a bushing.

Unless the bushings are press fitted into the couplers, you'll probably have wobble/balance issues. Just my opinion . . . .

[ScarabChris]

Unless the bushings are press fitted into the couplers, you'll probably have wobble/balance issues. Just my opinion . . . .

Yeah I know, I would have to be super lucky to find a bushing that matches exactly.

I'm screwed on this build until some 6mm X .250 couplers surface.

[ScarabChris]

I may have found a solution........

http://www.smallparts.com/bunting-bearings-cbm006008010-bronze-c93200/dp/B003HIX7RU/ref=sr_1_40?sr=1-40&qid=1291351398

Should allow me to use an 8mm coupler which seem to be abundant.

[nomobux]

Usually ships in 4 to 6 weeks ?

[ray schrauwen]

I have made my own couplers too.

I use set screws and never had a problem. Of course I do it with 9 set screws.

Made my own so far...

[ray schrauwen]

BTW, I'm breaking out my lathe today to do other couplers etc...

[ray schrauwen]

I may have found a solution........

http://www.smallparts.com/bunting-bearings-cbm006008010-bronze-c93200/dp/B003HIX7RU/ref=sr_1_40?sr=1-40&qid=1291351398

Should allow me to use an 8mm coupler which seem to be abundant.

That depends on if the coupler you have is Exactly 8mm!! by my experiences shafts & couplers aren't Exact numbers...

[ScarabChris]

Usually ships in 4 to 6 weeks ?

Yeah that is for the 6mm bore X 8mm OD X 10mm long. They were out of stock.

I got the same thing but 8mm long and it shipped same day. I'll just need to use a couple in each coupler. I got 8 of them.

[ScarabChris]

That depends on if the coupler you have is Exactly 8mm!! by my experiences shafts & couplers aren't Exact numbers...

Then wouldn't that problem also exist if I was able to find 6mm couplers for these motors?

I'm going to try them out. If it works I will have the perfect system. I got the 8mm X .250 couplers from OSE and from Bonzi I got counter rotating flex cables with square ends. Then I got the square insert for the couplers.

The way these MHZ drives are you don't need the collet to hold the shaft in. The flex cable is soldered into the prop shaft and the prop shaft can't come out without disassembling the drive.

[ray schrauwen]

Then wouldn't that problem also exist if I was able to find 6mm couplers for these motors?

I'm going to try them out. If it works I will have the perfect system. I got the 8mm X .250 couplers from OSE and from Bonzi I got counter rotating flex cables with square ends. Then I got the square insert for the couplers.

The way these MHZ drives are you don't need the collet to hold the shaft in. The flex cable is soldered into the prop shaft and the prop shaft can't come out without disassembling the drive.

Yes, from Octura they have runout. When you slide on a flex hex, you can feel the side to side slop. It's about .0005"- .001" Some are worse.

Give what you have a runn it may be just fine.

For me I like a transition or even a very, very slight interference fit. Some I have made need alot of force to go on or off, but they run smooth, 40K smooth.

[ray schrauwen]

http://www.toughracing.com/zc126d/index.php?main_page=product_info&cPath=11_46&products_id=1307

Look what I found!