HS125MG retaining screws  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> HS125MG retaining screws
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HS125MG retaining screws - 9/1/2007 5:15:59 AM   
flybye33


 

Posts: 12
Joined: 1/2/2006
From: Brisbane, AUSTRALIA
Status: offline 		Just purchased 4 x 125MG servos..The output arm retaining screw on all four will not mate. Screws OD are 0.090" or 2.22m/m. The supplied screw goes in 2 turns then locks up. Maggy lamp shows clean M/C threads in the output shafts.

Tried metric threads, 2/56, 3/48, 4/40 not close.

Closest I can get is with a 6BA thread which at least goes in 4 turns.

Anyone else had this problem? What's the solution? I will not use PK screws.

Thanks,
Brian
       Post #: 1

RE: HS125MG retaining screws - 9/1/2007 7:14:36 AM   
A.T.


 

Posts: 551
Joined: 7/20/2002
From: Auckland, NEW ZEALAND
Status: offline
quote:

ORIGINAL: flybye33 Just purchased 4 x 125MG servos..The output arm retaining screw on all four will not mate. Screws OD are 0.090" or 2.22m/m. The supplied screw goes in 2 turns then locks up. Maggy lamp shows clean M/C threads in the output shafts.
Tried metric threads, 2/56, 3/48, 4/40 not close. Closest I can get is with a 6BA thread which at least goes in 4 turns. Anyone else had this problem? What's the solution? I will not use PK screws. Thanks, Brian

HS-125MG specfication .pdf
Hitec Screw Set for Metal Geared Servos #55802 "Metal servo Screw Set (5 x short, 5 x long)".
Standard Servo Screws (Metal Gear Servos) 2.6mm x 6 mm & 8 mm to fit
HS-225MG, HS-525MG, HS-625MG, HS-645MG, HS-705MG, HS-925MG, HS-945MG, HS-5245MG, HS5625MG, HS-5645MG, HS-5745MG, HS-5925MG, HS-5945MG, HS-5955TG, HS-5995TG, HS-5996TG, HS-5997TG, HS-5998TG.
The small screws [Five 2.2 x 5 mm Phillip-head screws] fit the HS-65MG, HS-81MG, HS-85MG, HS-125MG.
NB: Never use loctite, in need if star washer is lost, Liquid Thread Lock used sparingly and ensure none remains in contact with plastic parts.
Hitec Screw Set for Resin Geared Servos
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links

(in reply to flybye33)
       Post #: 2

RE: HS125MG retaining screws - 9/1/2007 9:53:08 PM   
flybye33


 

Posts: 12
Joined: 1/2/2006
From: Brisbane, AUSTRALIA
Status: offline 		Yep, 2.2x.5 should fit..But they don't!
The screws are supplied in the Hitek box.
Not one screw fits any one of the four servos.
Either the threads are undersize in the output shafts, or the screws are oversize.

Either way they don't fit.

Flying for 50 years;Including Pattern, Turbines, Electric, Pylon in my younger days etc. Over 80 servos, never has this trouble before.
Ex toolmaker so I understand about fits and tolerances.

Question is, what to do?


(in reply to A.T.)
       Post #: 3

RE: HS125MG retaining screws - 9/1/2007 10:26:15 PM   
A.T.


 

Posts: 551
Joined: 7/20/2002
From: Auckland, NEW ZEALAND
Status: offline
quote:

ORIGINAL: flybye33 Yep, 2.2x.5 should fit..But they don't! The screws are supplied in the Hitek box. Not one screw fits any one of the four servos. Either the threads are undersize in the output shafts, or the screws are oversize. Either way they don't fit.
Flying for 50 years;Including Pattern, Turbines, Electric, Pylon in my younger days etc. Over 80 servos, never has this trouble before. Ex toolmaker so I understand about fits and tolerances. Question is, what to do?


Visit LHS where servos purchased or check with your supplier for an exchange (unless all other servos/screws in same batch have a similar problem). Otherwise suggest you contact your Australian distributor Model Engines Ltd direct = mikefarnan@modelengines.com.au
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links



(in reply to flybye33)
       Post #: 4

RE: HS125MG retaining screws - 9/3/2007 4:11:37 AM   
flybye33


 

Posts: 12
Joined: 1/2/2006
From: Brisbane, AUSTRALIA
Status: offline 		Looks like there is a batch problem Al....

Hi Brian
You are right; we have checked all our stock and found the same problem. We have advise Hitec and are waiting for their answer on when we can get replacement stock. With your servos and because of your back ground, you can have a go at re taping them if you like. If it does not work, return them to us and we will replace them when we receive our replacement stock.

Thanks for the heads up we appreciate it.
Best Regards
Mike Farnan


(in reply to A.T.)
       Post #: 5

RE: HS125MG retaining screws - 9/3/2007 4:51:26 AM   
A.T.


 

Posts: 551
Joined: 7/20/2002
From: Auckland, NEW ZEALAND
Status: offline
quote:

ORIGINAL: flybye33 Looks like there is a batch problem Al.... Hi Brian
You are right; we have checked all our stock and found the same problem. We have advise Hitec and are waiting for their answer on when we can get replacement stock. With your servos and because of your back ground, you can have a go at re taping them if you like. If it does not work, return them to us and we will replace them when we receive our replacement stock.
Thanks for the heads up we appreciate it. Best Regards Mike Farnan


Finally got to check our current stock, from latest production run, of HFS-125MG. The 2.2mm X 8mm servo horn screws were tight at two turns on some whilst a number screwed down further before sticking. Close examination showed that the sticking screws had a heavier coat of paint- a quick light wipe with wire brush and all are now a good fit.
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links

< Message edited by A.T. -- 9/3/2007 5:45:53 AM >

(in reply to flybye33)
       Post #: 6

RE: HS125MG retaining screws - 9/3/2007 6:51:02 AM   
flybye33


 

Posts: 12
Joined: 1/2/2006
From: Brisbane, AUSTRALIA
Status: offline 		Thanks Alan that's good work.
The problem is more subtle than that though.....Check the photos

Screw was stripped in thinners and wire brushed, as you can see it's oversize

Yes you can screw it in (barely) but it's too tight for my liking

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize

(in reply to A.T.)
       Post #: 7

RE: HS125MG retaining screws - 4/4/2008 3:47:08 AM   
LS171Malibu


 

Posts: 316
Joined: 4/17/2003
From: FORT WORTH, TX, USA
Status: offline 		Am I glad to find this thread!!! I've been pulling out my hair. I have four new 125's and the same problem. I am trying to maiden a plane ASAP for a contest on 4-13-08, and the wing was designed to run this servo, and I am up against a wall. I find it VERY frustrating that this issue dates back to at least last year, and it has not been corrected. Hitec should do something to correct this before a customer is inconvenienced, there are plenty of competitors looking to find there way into the market.

_____________________________

Blake

(in reply to flybye33)
       Post #: 8

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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> HS125MG retaining screws
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