I just did one last week, from 90mm down to 88.5mm to fit different shroud. J.

Originally Posted by jofro

I just did one last week, from 90mm down to 88.5mm to fit different shroud. J.

I guess I will be using my lathe.

Many different ways all good all easy if you take ur time!

Originally Posted by jofro

I just did one last week, from 90mm down to 88.5mm to fit different shroud. J.

I did this once but the rotor jammed against the single cutter and almost melted the adapter to the rotor by friction. A file or beltsander (multicutters)work pretty fool proof.

I have used the method described by Air Head and it worked like a champ. If you make it a tad smaller put it in your shroud and use some fine sandpaper to get a nice close fit.

Ha! How about if I told you I mount the fan blade on the front of my pylon racer and sand the blades with a block while the blade is spinning full bore. Never had a balance problem, Fuzz?

ApexAero i cant tell if your kidding!
I need to cut a GreatPlanes and a GWS 30mm rotor down to 25mm will these ideas work for me?

The only difference I can tell from what Jofo is doing is that the fan is a bit more steady on a lathe and a sanding block is a bit more gentle than a cutting bit..dude have you nipped the tip of a prop? I'll spool it up and touch the edge of the prop to a cement table to balance it at the field when I don't have a spare. (not recomended but it works)is my favorite comment
PS: the last one I did was an Eflite 70 cut to a 64 lander on a 1W30, mounted the impeller on a sunracer for trimming, talk about efflux!

Originally Posted by ApexAero

The only difference I can tell from what Jofo is doing is that the fan is a bit more steady on a lathe and a sanding block is a bit more gentle than a cutting bit..dude have you nipped the tip of a prop? I'll spool it up and touch the edge of the prop to a cement table to balance it at the field when I don't have a spare. (not recomended but it works)is my favorite comment
PS: the last one I did was an Eflite 70 cut to a 64 lander on a 1W30, mounted the impeller on a sunracer for trimming, talk about efflux!

The problem with using a lathe is the chuck. Unless you have an expensive "zero set chuck", most chuck's are off .003 to 020" off center. especially if it made in China. Now this my not sound like much, but it will set the rotor out of balance, plus the cutting tool bit will cause the rotor to chip. This is the reason I use a sero set chuck on a rotary table on a vertical mill. And, you can control the amount you cut off accurately. Yea, you can do it all the way mentioned in here. But you can also use a "C" clamp as a micrometer, just depends how accurate you want.

My 2 cents worth

Larry E.

Originally Posted by LJE4357

.......But you can also use a "C" clamp as a micrometer, just depends how accurate you want.......

...............hee, hee, heeeeee. Whatta picture that would make.