B737 DIY Gauges servo gears ??

[ifeliciano]

What size/ratio gears are most using on your servos for your DIY gauges?

[mickc]

Most gauges I convert  I use 12t/24t gears, so 2:1.   Most servos only have 180 degrees of travel, but the needles need roughly 270-300 degrees depending on the gauge.  2:1 gives you enough travel and avoids using the area near the endstops.

Some need more, like the Diff pressure gauge, where the needles go almost 360 degrees, for that i used 15t/40t

[kurt-olsson]

Sweet! I will convert all my gauges like this.

[ifeliciano]

Thanks Mick!!

[ifeliciano]

To expand on this topic. What type servo are you all using? Digital or Analog(ue)? Does it matter?

[mickc]

In my experience, digital ones are more stable & accurate, but draw more power and tend to be a bit noisier.
Also digital ones tend to have more travel than analogue ones

[ifeliciano]

Mick,


Looking at the picture you attached previously, it seems the gears already have splines to mount directly to the servo. Is that correct or were the gears drilled and glued to the servo?

[Bob Reed]

So where does one buy these gears?

[mickc]

Mick,


Looking at the picture you attached previously, it seems the gears already have splines to mount directly to the servo. Is that correct or were the gears drilled and glued to the servo?

Usually the centre hole is drilled out and The star shaped servo horn is pressed into it and secured with epoxy

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[mickc]

So where does one buy these gears?

I get mine from RS components. They are made from Delrin.
You can get cheaper ones on EBay etc but they are much lower quality and harder to drill etc.

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[ifeliciano]

So where does one buy these gears?

Bob,

A lot of robotics web sites sell gear sets.

[Bob Reed]

So where does one buy these gears?

Bob,

A lot of robotics web sites sell gear sets.

Thanks!

[Joe Lavery]

Bob,

I've bought lots of small bits from technobots: have a look here!

https://www.technobotsonline.com/plastic-model-gears.html

Joe.

[ifeliciano]

So where does one buy these gears?

I get mine from RS components. They are made from Delrin.
You can get cheaper ones on EBay etc but they are much lower quality and harder to drill etc.

Sent from my HTC 2PS6200 using Tapatalk

What P/N gears do you "normally" use? Allied Electronics is the RS Components rep in the US.

[mickc]

So where does one buy these gears?

I get mine from RS components. They are made from Delrin.
You can get cheaper ones on EBay etc but they are much lower quality and harder to drill etc.

Sent from my HTC 2PS6200 using Tapatalk

What P/N gears do you "normally" use? Allied Electronics is the RS Components rep in the US.

This is the RS series I use

https://www.alliedelec.com/gears/gears/?navigation=4294708323&customfilter=Brand%2fSeries%3a285537+Series

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[ifeliciano]

Thanks Mick!!