DS410M is this normal?

[BavarianRob]

Hi all, been checking the 450 pro over and found some slop in my servos. The heli was second hand so I don't know how many flights it's had but it flies fine. Just wondered if the slop in the servos is normal or if replacing the gears would tighten things up. Going FBL soon so want to make sure this won't cause me problems.
Cheers.
Rob.

http://www.youtube.com/watch?v=4p9n_...e_gdata_player

[antsis]

Short answer, No! I would remove them and check the splines on the horns as well.

I have HS85MG's on my 450 Sport and they are solid.

[BavarianRob]

Hmmm, don't think it's the horns slipping as the screws are moving at the same time. They feel gritty sometimes when you move them by hand too so are the gears buggered?

[cjcj1949]

I think you have well used servos. I think that changing the gears would sort things out. I'm not sure that you would notice the difference if you think it flies ok. Something that is worn doesn't always cause a problem. If the aero forces are always acting in the same direction then slop will make no difference as the servo arm will be pushed against the gear. If the forces change direction then you will notice it. Perhaps that only happens when you change from negative to positive pitch. If the backlash has developed then the heli was probably flown in such a way that the forces were changing direction and caused this wear. The gears are quite expensive and a cheaper option might be TowerPro Mgs at £6. Changing servos is a pain though as everything needs to be set up again. Perhaps best to wait for the current good weather to finish (joke) and sort it out when the weather is colder.

[BavarianRob]

Hi CJ,
When I say it flies okay, I can control it ok and it's much more stable than my mcpx! I can get it in a good stable hover almost hands free, but it was second hand so i might well just be happy with it as I've not flown a brand spanker!

Would this problem affect me going fbl ?

[Jez N]

If the gears feel notchy when you manually move the servo horn, you may find it is the posts that the gears slide on to that are loose/knackered. On the align servos, i am not sure you can replace them like you can on some other servos. But i may be wrong.

I went for the hitec 5065mg and am very happy with them. Although most use the savox 0257mg sevos as replacements

[BavarianRob]

If the gears feel notchy when you manually move the servo horn, you may find it is the posts that the gears slide on to that are loose/knackered. On the align servos, i am not sure you can replace them like you can on some other servos. But i may be wrong.

I went for the hitec 5065mg and am very happy with them. Although most use the savox 0257mg sevos as replacements

Thanks Jez, I think I'll have them all to bits over the weekend (weather looks crap) and see if I can see anything obvious. Might go for the Savox alternative, everyone raves about them and won't be much more than replacing all the gears etc in the 410s.

[muscleflex]

i've just seen the video = i would say it's normal. the 410 servos are known to get sloppy after a while. just do a search and some people have posted about them already.
My 410 servos are sloppy too. I can't say if my slop is as much as yours but the slop is definitely there.
The new servo I bought a month ago didn't have the slop tho but another member had commented before that his new servo had the slop already.

For peace of mind, you can open up your servos just to check.. but i would say the slop is normal.
for your info, i don't do 3D. so i would say the slop ain't from flying hard.

Oh, and I fly FBL using a tarot zyx and DFC head

[James A]

I kind of agree with muscleflex, these servos did tend to have a fair degree of slop. The main thing you want to be aware of is twitch (where the servos move without any stick input). I have just finished rebuilding my 450 after I replaced a servo I noticed some twitch on, unfortunately 5 bats in on the new servo and it developed a serious twitch which just through it to the endstop, needless to say my gentle garden hover flipped straight into the ground. This does give you another thing to consider, if it aint broke don't fix it.

If you do decide to look at new servos you could look at the replacement for the 410m which is the 415m, £17.50 each from Fast lad so no real difference in price between that and the older Savox.

[cjcj1949]

If the heli flys ok for your style of flying then do nothing. Just fly it. Especially as other owners of 410 say theirs are just as bad. My Towerpros are not sloppy. If you want different servos that are not really cheap the HS65HBs are very good. They have Karbonite gears and these wear less than metal, but are nor as strong in a a crash. Servos do have wires from motors and pots to pcbs. Sometimes these wires are not glued onto the components correctly. They need to be glued so that the insulation is fixed to the component. This allows the flexible part of the wire to move. The alternative is that the junction between the wire that has wicked up the solder and gone solid and the flexible wire is allowed to flex. This causes a stress concentration and an eventual break, it often goes intermittent as well with the wire just touching held in place by the incorrectly applied glue. Worth checking if you do take the servos apart.

[BavarianRob]

Cheers guys, all three seem to be exactly the same so it does make sense that it's just the way they are. Might have them to bits anyway and get a bit of grease on the gears, can't hurt to give them a 'service'. Then I might see how they perform with a DFC head in a couple of weeks and go from there. Like you guys have said, if it flys okay, why change them. I'm no 3D guy either so I doubt I will notice it affecting my banked turns lol!

[Delta7]

Hi All, I have one knackered 410m and brought a new gear set but am having trouble fitting the new main cog back on, the one that has a little gold stud on, it does not seem to push down all the way, any ideas? Another 410 has dodgy wires which I can probably repair although if I replace both 410's with 5065mg or savox 0257mg is it best to change all 3 or leaving the elevator servo as a 410 would be ok?

[Gixxer]

Hi All, I have one knackered 410m and brought a new gear set but am having trouble fitting the new main cog back on, the one that has a little gold stud on, it does not seem to push down all the way, any ideas? Another 410 has dodgy wires which I can probably repair although if I replace both 410's with 5065mg or savox 0257mg is it best to change all 3 or leaving the elevator servo as a 410 would be ok?

There's a locator on the potentiometer shaft (one side of shaft cut away) the gear must locate with and it has to line up correctly. Once it's lined up correctly, a small amount of pressure should be sufficient to press it on.