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Author Topic: Linear servo - where to buy?  (Read 1403 times)

C-3PO

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Linear servo - where to buy?
« on: December 23, 2017, 01:24:24 PM »

Linear servo - I had a quick Google and didn't get any positive results

Are they still made? Can you still but them?

Thanks in advance

C-3PO
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bfgstew

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Re: Linear servo - where to buy?
« Reply #1 on: December 23, 2017, 01:31:06 PM »

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Subculture

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Re: Linear servo - where to buy?
« Reply #2 on: December 23, 2017, 01:35:10 PM »

You can get very small linear servos. They're low torque and designed for very light aeroplanes. e.g.

https://hobbyking.com/en_us/hobbyking-ultra-micro-servo-1-7g-for-3d-flight-left.html

If you want a standard size linear servo, the cheapest and easiest solution is the EMS kit, which adapts certain Futaba servos to a very nice linear servo.

http://www.emsjomar.com/linear.aspx

Becker in Germany did sell linear servos in various sizes, not sure on current availability.

Other than that, it's a case of searching on ebay for old Linear servos from the seventies by the likes of Futaba, Skyleader etc. Or DIY.

Brian60

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Re: Linear servo - where to buy?
« Reply #3 on: December 23, 2017, 04:24:54 PM »

I have a couple of the hobbyking type and to be honest, unless you are building a quadcopter for inside use they are too small and too feeble to move anything but the lightest load - I attached a sheet of A4 paper to one and it struggled to lift it when free hanging. They do larger types though, or they did for outside aero use.

Neil

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Re: Linear servo - where to buy?
« Reply #4 on: December 23, 2017, 04:39:42 PM »

please excuse my ignorance guys, but what are they and what do they do.
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Brian60

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Re: Linear servo - where to buy?
« Reply #5 on: December 23, 2017, 04:45:05 PM »

please excuse my ignorance guys, but what are they and what do they do.

A standard servo makes a rotary movement.

A linear servo converts the rotary movement into a back and forth movement similar to pulling open/closed a drawer, it does this by using a worm drive and toothed track.

C-3PO

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Re: Linear servo - where to buy?
« Reply #6 on: December 23, 2017, 04:56:20 PM »

Linear servo - sort of like this

The ones I used many moons ago had 2 attachment points that traveled in opposite directions to each other



C-3PO
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C-3PO

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Re: Linear servo - where to buy?
« Reply #7 on: December 23, 2017, 05:53:59 PM »

Possibly a neat 3D printed solution - thanks Tim Garrod

https://hackaday.com/2016/03/31/3d-printed-case-turns-servo-into-quality-linear-actuator/



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timgarrod

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Re: Linear servo - where to buy?
« Reply #8 on: December 23, 2017, 06:17:45 PM »

No Problem C3po, Will print one off next week a give it a go. not a neat as the adaptor that go on top of the servo but a option .
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The Old Fart

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Re: Linear servo - where to buy?
« Reply #9 on: December 23, 2017, 07:25:14 PM »

C-3PO

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Re: Linear servo - where to buy?
« Reply #10 on: December 23, 2017, 07:56:27 PM »

Hi Dave,

I guess an enhanced version of Tim's initial suggestion - I will consult Tim (shapeways) Garrod to see what his rates are as I don't have a 3D printer and my piggy bank currently is ear marked for a sub...

C-3PO

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derekwarner

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Re: Linear servo - where to buy?
« Reply #11 on: December 23, 2017, 09:27:26 PM »

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C-3PO

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Re: Linear servo - where to buy?
« Reply #12 on: December 24, 2017, 11:05:57 AM »

Hi Derek,

Thanks for that suggestion - I am familiar with the "linear actuator" they are widely availbale in the UK - I discounted these as I didn't want to sell a body part to facilitate purchase.

I can only assume it's the limited production/ more involved engineering (gear box) that determines such a high price of these actuators - some of them are eye wateringly expensive 60+

I think Tim/Dave's suggestion have merit at an affordable cost... - I also think this "travelling nut" could work well and is simple to hook up to



Cheers

C-3PO
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The Old Fart

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Re: Linear servo - where to buy?
« Reply #13 on: December 24, 2017, 12:21:34 PM »

Are yes, these are used for the Z axis on my 3d printers.

Brian60

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Re: Linear servo - where to buy?
« Reply #14 on: December 24, 2017, 01:59:10 PM »

Does it have to be a servo Threepio? What about these linear stepper drives, I have two of these in my ship at the moment, just needs a bit of arduino code ok2

AliExpress or Banggood is your friend for them.
 

steamboatmodel

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Re: Linear servo - where to buy?
« Reply #15 on: December 24, 2017, 03:59:57 PM »


Does it have to be a servo Threepio? What about these linear stepper drives, I have two of these in my ship at the moment, just needs a bit of arduino code ok2

AliExpress or Banggood is your friend for them.
If you have any old cd/dvd drives you may find some of those small steppers with the traveling mechanism in them.
Gerald.
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