high torque servo

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TyBreaker - 22 Apr 2006 21:11 GMT

Some time ago I was looking at Hi-tec HS-645MG servos for use in a
monster truck but as time as passed, I was wondering what folk are using
nowadays? I'm getting a TXT-1 and would like to get a steering servo
that can turn the wheels when moving slowly eg rock crawling.

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DanTXD - 23 Apr 2006 01:26 GMT

> Some time ago I was looking at Hi-tec HS-645MG servos for use in a monster
> truck but as time as passed, I was wondering what folk are using nowadays?
> I'm getting a TXT-1 and would like to get a steering servo that can turn
> the wheels when moving slowly eg rock crawling.

I have a Savage, 645 on steering here, 625 on throttle, no complaints :-)

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Dan

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TyBreaker - 23 Apr 2006 01:41 GMT

> I have a Savage, 645 on steering here, 625 on throttle, no complaints :-)

OK, I have a couple of other questions related to this. I notice you
can get digital vs analogue servos - what's the deal there? And also,
some servos are compatible with Hitec/JR radios and others with Futaba -
I haven't decided on a radio yet so is it possible to modify a servo
for a Hitec to fit a Futaba and vice versa? If it's a problem, I'll
just need to buy a radio earlier than I'd planned.

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nospam@noway.com - 23 Apr 2006 05:41 GMT

>> I have a Savage, 645 on steering here, 625 on throttle, no complaints :-)
>
[quoted text clipped - 4 lines]
> Hitec to fit a Futaba and vice versa? If it's a problem, I'll just need
> to buy a radio earlier than I'd planned.

I'm running Hitec 645MG's for steering on all three 1/8 scale vehix (Savage
Monster Truck, Mayhem ST Truggy and Kanai 3 Buggy) and Hobbico CS-64 on
throttle/brake. No complaints and they do their job well.

Futaba connectors have a little "fin" on one end of the connector that
prevents them from fitting into non-Futaba receivers. All you have to do is
cut that little fin off with a hobby knife or sand it off with a Dremmel and
they'll slide right in to non-Futaba rx'es.

Digital servos respond more quickly, center better and have more "stops"
between one end of servo travel and the other making precise adjustments
(sub-trim, trim) and more precise input movements possible. Very important
in airplanes and maybe touring cars and buggies, but they'd be a waste of
money in a TXT or any other MT for that matter.

Doc

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TyBreaker - 23 Apr 2006 09:24 GMT

"Doc" wrote:

> Futaba connectors have a little "fin" on one end of the connector that
> prevents them from fitting into non-Futaba receivers. All you have to do is
> cut that little fin off with a hobby knife or sand it off with a Dremmel and
> they'll slide right in to non-Futaba rx'es.

Does this fin removal still result in a snug fit or is it loose? Also,
sounds like the reverse may be a problem then ie fitting a non-Futaba
servo to a Futaba receiver? I guess even if it's a tad loose, one could
always engineer something to hold it in place?

> Digital servos respond more quickly, center better and have more "stops"
> between one end of servo travel and the other making precise adjustments
> (sub-trim, trim) and more precise input movements possible. Very important
> in airplanes and maybe touring cars and buggies, but they'd be a waste of
> money in a TXT or any other MT for that matter.

Thanks for this info - I've found it a real struggle to find basic rc
info like this anywhere on the web.

I'm very happy with ebay though - such savings on the kit, ball bearings
etc, much better than my local LHS. Where I live there are only two and
both have healthy profit margins ;)

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nospam@noway.com - 23 Apr 2006 17:18 GMT

Inline......................

> "Doc" wrote:
>> Futaba connectors have a little "fin" on one end of the connector that
[quoted text clipped - 6 lines]
> servo to a Futaba receiver? I guess even if it's a tad loose, one could
> always engineer something to hold it in place?

Futaba connector: XXXx

Non-Futaba connector: XXX

The lower-case x is the little "fin" I mentioned. The XXX are the positive,
signal and negative spots on the connector, which are identical between the
two. The fit is snug. My Savage has a Futaba radio system and I'm running
all non-Futaba servos on it. Have been doing so for around 10 gallons of
brutal bashing and they've never come loose. I don't know why Futaba
insists on being different to be perfectly honest with you! If it's really
bugging you and hacking the fin makes you squirmish, wire adapters do exist
to go from Futaba-to-non-Futaba or vice versa for about $5.

>> Digital servos respond more quickly, center better and have more "stops"
>> between one end of servo travel and the other making precise adjustments
[quoted text clipped - 4 lines]
> Thanks for this info - I've found it a real struggle to find basic rc info
> like this anywhere on the web.

I feel ya on that one bud; I had the same issues when I first got started
and found this place to be a great source of info.

> I'm very happy with ebay though - such savings on the kit, ball bearings
> etc, much better than my local LHS. Where I live there are only two and
> both have healthy profit margins ;)

E-Bay does kick some major a.s when it comes to RC pieces parts!

Doc

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Richard - 23 Apr 2006 07:00 GMT

> Some time ago I was looking at Hi-tec HS-645MG servos for use in a
> monster truck but as time as passed, I was wondering what folk are using
> nowadays? I'm getting a TXT-1 and would like to get a steering servo
> that can turn the wheels when moving slowly eg rock crawling.

I bought 4 cheap Tower Pro copies of the Hitec servos off ebay. Paid $30
(AUS) each for them. They are rated at 15Kg/cm (6v) and have dual ball
bearings. Replacement parts as I have been told come from Hitec 945MG's,
but at $30 I can afford to break a servo and replace as needed.

I have one at each end of my Clod and one in each of my nitro trucks. I've
actually found them to be too fast for steering on the nitro trucks and with
no servo saver in my Clod I have yet to break a gear.

http://www.rcuniverse.com/market/item.cfm?itemId=183997
Ebay item number 6052134705 if your interested

Cheers
Richard

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M78Ultra - 24 Apr 2006 15:14 GMT

Hey cool,
Glad to hear someone is using those (mg995) and they hold up well...I just
ordered 3 of them a few days ago just to try them.
$12 + shipping... figured worth a shot since the specs looked decent.
ebay item: 6051391282

> > Some time ago I was looking at Hi-tec HS-645MG servos for use in a
> > monster truck but as time as passed, I was wondering what folk are using
[quoted text clipped - 15 lines]
> Cheers
> Richard

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Model Forum / Radio Controlled / Land Models / April 2006

high torque servo