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Author Topic: B737 DIY Gauges servo gears ??  (Read 865 times)

Offline ifeliciano

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B737 DIY Gauges servo gears ??
« on: November 08, 2017, 10:13:23 AM »
What size/ratio gears are most using on your servos for your DIY gauges?

Offline mickc

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Re: B737 DIY Gauges servo gears ??
« Reply #1 on: November 08, 2017, 05:40:48 PM »
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


Offline kurt-olsson

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Re: B737 DIY Gauges servo gears ??
« Reply #2 on: November 09, 2017, 04:39:56 AM »
Sweet! I will convert all my gauges like this.

Offline ifeliciano

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Re: B737 DIY Gauges servo gears ??
« Reply #3 on: November 09, 2017, 09:59:01 AM »
Thanks Mick!!

Offline ifeliciano

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Re: B737 DIY Gauges servo gears ??
« Reply #4 on: November 10, 2017, 10:34:57 AM »
To expand on this topic. What type servo are you all using? Digital or Analog(ue)? Does it matter?

Offline mickc

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Re: B737 DIY Gauges servo gears ??
« Reply #5 on: November 10, 2017, 07:52:07 PM »
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

Offline ifeliciano

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Re: B737 DIY Gauges servo gears ??
« Reply #6 on: November 25, 2017, 10:52:01 AM »
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?

Offline Bob Reed

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Re: B737 DIY Gauges servo gears ??
« Reply #7 on: November 25, 2017, 11:08:48 AM »
So where does one buy these gears?

Offline mickc

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Re: B737 DIY Gauges servo gears ??
« Reply #8 on: November 25, 2017, 03:29:27 PM »
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

Sent from my HTC 2PS6200 using Tapatalk


Offline mickc

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Re: B737 DIY Gauges servo gears ??
« Reply #9 on: November 25, 2017, 03:31:43 PM »
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


Offline ifeliciano

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Re: B737 DIY Gauges servo gears ??
« Reply #10 on: November 25, 2017, 04:00:18 PM »
So where does one buy these gears?

Bob,

A lot of robotics web sites sell gear sets.

Offline Bob Reed

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Re: B737 DIY Gauges servo gears ??
« Reply #11 on: November 26, 2017, 12:25:55 AM »
So where does one buy these gears?

Bob,

A lot of robotics web sites sell gear sets.

Thanks!

Offline Joe Lavery

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Re: B737 DIY Gauges servo gears ??
« Reply #12 on: November 26, 2017, 01:23:31 AM »
Bob,

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

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

Joe.
'Life isn't about waiting for the storm to pass, it's about learning to dance in the rain!'

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Offline ifeliciano

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Re: B737 DIY Gauges servo gears ??
« Reply #13 on: November 26, 2017, 02:17:29 AM »
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.

Offline mickc

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Re: B737 DIY Gauges servo gears ??
« Reply #14 on: November 26, 2017, 04:18:41 AM »
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

Sent from my HTC 2PS6200 using Tapatalk


Offline ifeliciano

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Re: B737 DIY Gauges servo gears ??
« Reply #15 on: November 26, 2017, 03:53:47 PM »
Thanks Mick!!

 

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