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10-23-2015 04:20 AM

Lazy Ace

Re: Servo horn drill bit, (beware)

As has been said those pop off ball links are a recipe for disaster. If you can pop them on they can pop off under hard load or vibration. The more worn (used) the easier they may disconnect. We stopped using them many years ago when we flew Gremlin Combat planes with the sliding trays for elevons. We first used them because of the ease of set up but soon found there were too many incidences where they came off.

The only standard ball link in my opinion is the Dubro 259 4-40 Heavy Duty Threaded Ball Link for 4-40 rods. I don't use 2-56 for anything but small stuff. I use minimum 4-40 control rods when ever I can. http://www.chiefaircraft.com/radio-c...s/dub-259.html

The other captured ball links work well as I see them used on large models as well. Again 4-40 or larger save the 2-56 stuff for the smaller stuff.

Dennis

10-23-2015 02:07 AM

Max

Re: Servo horn drill bit, (beware)

Quote:

Originally Posted by stegl

I've never had that problem, maybe it also depends on the quality of the ball link used? My experience has just been the opposite. I have used them in high-stress environements and i found them to be quite reliable.

Quote:

Originally Posted by stegl

I use the HD swivel ball links with a washer on the outer side of the ball link and has never failed me yet

I agree. The example I showed was just what I quickly grabbed off the internet. The locking ball link are the best type of ball link to use

10-22-2015 11:54 PM

stegl

Re: Servo horn drill bit, (beware)

The ball and snap on socket should never be used in anything other than maybe throttle arms as under stress they can pop off with disatreous results. Ask me , I found that out many years ago and never forgot it.

I use the HD swivel ball links with a washer on the outer side of the ball link and has never failed me yet

10-22-2015 08:56 PM

Max

Re: Servo horn drill bit, (beware)

Quote:

Originally Posted by Pauld

Thanks, I hate sloppy linkages with a passion.

PaulD

The best way to get rid of sloppy linkages is to do away with a pin-in-the-hole linkage and go with a ball link instead. Screw the ball into the horn /servo arm and the ball socket into the threaded end of your pushrod. Makes a huge difference.

Linkage sets are sold by both Dubro and Sullivan
example:
http://shop.dubro.com/p/2-56-threade...link-qty-pkg-1

10-22-2015 12:31 AM

Pauld

Re: Servo horn drill bit, (beware)

Thanks, I hate sloppy linkages with a passion.

PaulD

10-20-2015 12:46 AM

Max

Re: Servo horn drill bit, (beware)

Quote:

Originally Posted by ace7038

Remember one thing when using drill bits, hey always drill oversize from their measurement

Ya. For that reason I always drill undersize, measure and then ream slowly to the desired size

10-19-2015 07:04 PM

ace7038

Re: Servo horn drill bit, (beware)

Remember one thing when using drill bits, hey always drill oversize from their measurement

10-18-2015 06:05 PM

Daren71

Re: Servo horn drill bit, (beware)

Quote:

Originally Posted by tommy

I purchased a servo horn bit #48. It looked large but I drilled the horn, installed the clevis and it was an over size hole which was not usable to me. So out came the dial indicator to check. #48 bit is .076 dia. The clevis pins are- .060 Asian, .063 Sullivan, and .064 Great planes, leaving .016- .012 slop at the servo. This is both 2-56 and 4-40 linkages. So I simply renewed the horn and used the 1/16 .bit ( .0625) I will try a #52 bit .0635 for the horn as soon as I find one to buy.

Busy Bee sellls a nice numbered drill set. I needed it for my GP Rifle. If I recall, it wasn't that expensive for about 20 drill bits.

I always try to test fit first, on a scrap piece of something first. Ususally my digital dial indicator has a dead battery in it.

You posted some valuable info. Thanks.

10-18-2015 05:33 PM

tommy

Servo horn drill bit, (beware)

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