Cheap components for an antweight class

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peterwaller
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Re: Cheap components for an antweight class

Post by peterwaller » Sat Aug 06, 2016 10:26 am

Just bought 5 of the MG90S servo's for £9.55 with free delivery.
Ordered them Thursday afternoon and they arrived this morning and all work fine.
http://www.ebay.co.uk/itm/261214133155? ... EBIDX%3AIT

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peterwaller
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Re: Cheap components for an antweight class

Post by peterwaller » Sat Aug 06, 2016 3:25 pm

They are surprisingly easy to modify to full rotation.
Remove the four screws.
Take off the gearbox cover.
Pull the output gear off the shaft this is quite a tight fit so needs a bit of pulling.
Image
The output gear has a plastic insert that runs on the shaft and acts as an end stop so you need to cut off the end stop part while leaving the centre as below.
Image
Drill out the plastic insert to 1.4 mm so it runs freely on the brass coloured shaft which is the feedback pot shaft.
Remove all the gears and plug the servo in to a receiver on the aileron channel and make sure it runs.
Then with the stick and trims centered adjust the pot shaft until the motor is stopped.
Put a enough hot melt glue into the pot mechanism as above to ensure it can't move but careful to clean any off the shaft.
Replace the gears and gearbox cover and ensure it all runs when connected to the receiver.
Replace the four screws.
You will find there is quite a lot of end float on the output shaft so I printed some small washers 7.3mm OD, 5.6mm ID and 0.7mm thick and placed it over the output shaft between the final gear and the plain metal bearing to reduce this.

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UserFriendly
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Re: Cheap components for an antweight class

Post by UserFriendly » Tue Aug 09, 2016 10:28 am

Looks good Pete, however, the teeth in your image seem to stick out, is that a problem?:

Image
Andy B - Team UserFriendly
Reading Cybernetics Graduate 1996
Trying not to take Antweights too seriously. I think I'm failing.
First AWS was 46.

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UserFriendly
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Re: Cheap components for an antweight class

Post by UserFriendly » Tue Aug 09, 2016 10:28 am

...actually, I think I see it. Those teeth are shorter aren't they?
Andy B - Team UserFriendly
Reading Cybernetics Graduate 1996
Trying not to take Antweights too seriously. I think I'm failing.
First AWS was 46.

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peterwaller
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Re: Cheap components for an antweight class

Post by peterwaller » Tue Aug 09, 2016 3:12 pm

Yes they are shorter that is where the plastic end stop was.

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