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Stripped control horn screws 645MG 625MG

Old 01-02-2006, 01:51 AM
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Default Stripped control horn screws 645MG 625MG

I've had 3 of 5 brand new 645MGs and a 625MG on which the control horn screws were so tightly installed at the factory, I stripped them trying to remove the circular control horn.

I fixed one by carefully making a straight cut in the stripped screw (with a Dremel tool cutting blade) and removed with a straight blade scrwedriver. Another one I attempted to fix the same way broke when trying to extract it, probably because I made the cut too deep into the screw head. When the 625MG also stripped I did not attempt any fix.

I'm returning both the 645MG and 625MG to the factory to have the screws removed or the units replaced.

This seems to be a recurring problem with these MB servos (having the same problem in 4 of 7 servos purchased). It's extremely frustrating. I chose these servo's over my usual airtronics brand because they are competivitely priced. They are working beautifully in my 1/5th scale Suhkoi 26M, so I purchased them for my new Aeroworks Edge 540T .46-.61/

What gives here?

Old 01-02-2006, 09:19 AM
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Default RE: Stripped control horn screws 645MG 625MG

I think a lot of the problems with stripped servo screws is the use of improper screwdrivers. The screw heads have JIS slots (Japanese Industrial Standard). If you use an American type Phillips screw driver you will strip it out. Once you use a set if JIS screw drivers you will wonder how you got along without them.
Old 01-02-2006, 12:18 PM
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Default RE: Stripped control horn screws 645MG 625MG

The problem originates as mentioned is with utilizing the wrong type of screwdriver...

FYI: Do not use threadlockers in the future on any metal geared servos.
Old 01-02-2006, 12:49 PM
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Default RE: Stripped control horn screws 645MG 625MG

Pile-o-wood:

Thanks. I had no idea that JIS screwdrivers existed.

Apparently you've solved my (rather costly) mystery.

I'll pick up a set ASAP.

Old 01-02-2006, 12:51 PM
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Default RE: Stripped control horn screws 645MG 625MG

Michael:

Can the broken or stripped screws be removed at the factory, or do these servos need to be trashed?

Old 01-02-2006, 01:14 PM
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Default RE: Stripped control horn screws 645MG 625MG

Yes, I suspect the Service Tech handle it for you. Or try yourself by breaking/cutting away the nylon wheel and exposing the shaft of the screw then grab it with pliers it should come right out.
Old 01-02-2006, 01:23 PM
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Default RE: Stripped control horn screws 645MG 625MG

Thanks. I'll give it a try.

Appreciate the quick feedback and suggestions.
Old 01-02-2006, 01:48 PM
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Default RE: Stripped control horn screws 645MG 625MG

Michael:

Got the screw out of the 625, but the 645 was broken flush with the shaft. I'll go ahead and return that one to service.

So I can pick up some replacements, what size is this servo screw? Is this standard on all HITEC servos?

Thanks.
Old 01-02-2006, 02:53 PM
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Default RE: Stripped control horn screws 645MG 625MG

Hitec metal-geared standard size servos use 2.6x8mm screws.
Old 01-09-2006, 10:19 PM
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Default RE: Stripped control horn screws 645MG 625MG

Why no thread lockers?
Old 01-10-2006, 02:51 AM
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Default RE: Stripped control horn screws 645MG 625MG

Most modelers use either to much or the wrong type and are unable to break the screws loose. There are other products that are better suited such as Shoe-Goo/PFM a smaaaalll dab of canopy glue or white glue. These products easily break away for future maintenance.
Old 01-10-2006, 12:44 PM
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Default RE: Stripped control horn screws 645MG 625MG

Michael:

I just wanted to rave about the HITEC customer service. I already received the 645MG with the gear replace. No charge and in record time!

Great job.

I'm one very happy (and much better educated) customer.

BTW, I got the JIS screwdriver set as well. Everything works perfectly.

Thanks all for the help!
Old 01-10-2006, 05:33 PM
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Default RE: Stripped control horn screws 645MG 625MG

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