Having dificulties in taking the pinion out

[mfbs17]

I have recently put a new pinion on my hacker without using any locktite to secure the 3 mm screw but obviously I have thighten it a littel bit to much and having difficulties to remove the screw .Any suggetion would be apperciated.Thanks in advance.:)

[helicraze]

A tiny easy out removal tool or heat it or try a imperial allen key or last thing cut it off with dremel and destroy the pinion!

[Klinger]

I've found after semi-stripping internals of the metric grub-screw i've used a slightly bigger imperial key (maybe i ground it a bit too cant remember) and jammed it in which removed it!

[ShuNut]

Yeah, these pinons-grub-screws are waaay too small for 30 & 50 size helis, i messed one up without the heli even flying, and its like £15 with shipping for a new one.

They need to make them bigger, i mean they're the same size as my 450 pinons-grub-screw !

Peace

[Eyon]

a pinion has no load uppon it, i mean, there is no need what so ever to have a big grub screw, all it is is pinching the shaft. and a small grub screw in theory will hold better because with the same force there will be higher pressure

what you can sometimes find is that if you over tighten, but still get it out, but cant pull the pinion off, its because you get a burr where the grub screw went, so get ready to pullllll as hard as possible :) or make sure you have a flat on the shaft so the burr wont get in the way of the pinion

Ian

[Funflyer]

Don't forget that a small grub screw with the same force also has a higher potential to make a burr. I agree the Mikado grub screws are way too small. A bigger screw would be a lot easier to tighten and remove without the risk of damage to the screw or shaft.

And I agree that it is much better to grind a flat spot on the shaft. Just be careful how much loctite you use. The guy I bought my heli from used waaaay too much and it wicked down the hole and filled the flat spot gap. You should put loctite on at least 3 threads all around the screw, then wipe off the excess with your fingers. You only need a tiny bit of loctite down in the thread.

If the screw head is stripped you need one of those special tools that looks like a reversed drill bit. They are designed to dig into the metal so you get a good grip, but I don't know how easy they are to find in the stores.

Good Luck!

[ShuNut]

Some good points there but if they're not too small then they're too weak !
With my messed up grub screw-pinion i had the thread slightly crossed, and when i tried to take grub screw out the "hex" part where you put the tool stripped...... WEAK !

Now IF it was a bigger screw it would have been ok.