Question About Parts Tolerances (.03mm)

rccopter · 05-04-2012, 12:16 PM

I am rebuilding my 450 after a crash The old flybar is 1.95mm in diameter and slides through the metal head fine. The new flybar is 1.98mm and it will NOT slide through - it's almost a perfect pressed fit.

This VERY slight difference must be a manufacturing tolerance issue. I've tried polishing it with fine sandpaper and steel wool but can't reduce its diameter enough. I have a couple of new ones on order, hopefully they will be 1.95mm. Anyone experience these types of tolerance issues?

Thanks.

Rick

markb · 05-04-2012, 12:29 PM

You could have ordered a Vbar. They always fit just right!

But seriously. No. When I used flybars, they always just slipped right in. Sure its the right one, and nothing in the head is buggered up?

Does one end of your old flybar slip right in - I mean, up until the bent part. I'm assuming its bent - hence the rebuild.

rccopter · 05-04-2012, 12:52 PM

Yes, the old flybar slips all the way through fine (up to the bend). I'm saving my $ so I can convert my fleet to flybarless, but that won't be for a while.

Rick

fastflyer20 · 05-04-2012, 12:58 PM

You are experiencing the difference in .001" (.03mm), you go from a slip fit to a press fit. One of the reasons it is difficult to alway have press fits on bearings, etc. You would be better of enlarging the hole by .001" if you have the perfect size drill. It would still work fine with smaller FB rods.

05-04-2012, 12:16 PM	#1
rccopter Registered Users Join Date: May 2009 Location: Vermont	Question About Parts Tolerances (.03mm) I am rebuilding my 450 after a crash The old flybar is 1.95mm in diameter and slides through the metal head fine. The new flybar is 1.98mm and it will NOT slide through - it's almost a perfect pressed fit. This VERY slight difference must be a manufacturing tolerance issue. I've tried polishing it with fine sandpaper and steel wool but can't reduce its diameter enough. I have a couple of new ones on order, hopefully they will be 1.95mm. Anyone experience these types of tolerance issues? Thanks. Rick __________________ Gaui 550 w/ quark gyro, Spektrum dx6i radio, Trex 450, e-Flite Blade MSR, MCPX, 130X, e-sky Belt CP V2, Honey Bee V2

05-04-2012, 12:29 PM	#2
markb Registered Users My HF Map location Join Date: Sep 2007 Location: Virginia Beach, VA	You could have ordered a Vbar. They always fit just right! But seriously. No. When I used flybars, they always just slipped right in. Sure its the right one, and nothing in the head is buggered up? Does one end of your old flybar slip right in - I mean, up until the bent part. I'm assuming its bent - hence the rebuild. __________________ Mark Logo 600se, Scorpion 5020-450, mini-V, Jive 80HV Trex 600 ESP FBL, Scorpion 4025-740, cgy750, CC85HV Trex 450 Vx FBL, Scorpion 2221-10, RJX head, mini-V, Ice 50

05-04-2012, 12:52 PM	#3
rccopter Registered Users Thread Starter Join Date: May 2009 Location: Vermont	Yes, the old flybar slips all the way through fine (up to the bend). I'm saving my $ so I can convert my fleet to flybarless, but that won't be for a while. Rick __________________ Gaui 550 w/ quark gyro, Spektrum dx6i radio, Trex 450, e-Flite Blade MSR, MCPX, 130X, e-sky Belt CP V2, Honey Bee V2

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05-04-2012, 12:58 PM	#4
fastflyer20 Registered Users Join Date: Nov 2008 Location: Buffalo Area	You are experiencing the difference in .001" (.03mm), you go from a slip fit to a press fit. One of the reasons it is difficult to alway have press fits on bearings, etc. You would be better of enlarging the hole by .001" if you have the perfect size drill. It would still work fine with smaller FB rods.