Sherman prototype recoil

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Adrian Harris
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Sherman prototype recoil

Post by Adrian Harris » Sat Feb 06, 2010 4:11 pm

I've finally managed to get the recoil system on the prototype Sherman working as I would like.

When I initially stripped the tank down, it looked like this:

Image

Now I've cleaned up the parts and replaced the servo, it looks like this:

Image

This is the unit in operation: http://www.youtube.com/watch?v=pQSiuzfaQz0

The servo is a Sanwa ERG-VRX, which is supposed to operate at 0.06 seconds per 60 degree arc but I don't think it's quite that fast. The servo is being controlled by a PICAXE 08 chip, hence the dual speed operation. To get the best from the servo, I'm running the whole circuit from 6 volts but I think it would be safer for the rest of the electronics if I create a split supply.

For those wondering why their Sherman doesn't have a recoil system, I believe this was superseded by the blank firer before the Sherman kit was released.

Personally, I'm torn between leaving it as it was originally designed or changing the length of the arm attached to the servo, to increase the speed of attack.

Adrian.

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Antony Rowley
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Post by Antony Rowley » Sat Feb 06, 2010 5:26 pm

Hi Adrian,

Very smooth :wink: How are you going to sinc the firing dound with the recoil :?:

Thanks Antony
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Adrian Harris
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Post by Adrian Harris » Sat Feb 06, 2010 5:33 pm

One of the handy things about the PICAXE is that it can read RC servo signals, so it should be possible to link it to the receiver and synchronise them that way.

One slight hiccough is that the original Sherman sound system doesn't have a built-in main gun sound, just the machine gun, so I may have to improvise :wink:

Adrian.
Last edited by Adrian Harris on Sat Feb 06, 2010 10:39 pm, edited 1 time in total.

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leesellars
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Post by leesellars » Sat Feb 06, 2010 5:42 pm

Hello Adrian

I have a Benedini in mine its a great improvement on the original armortek version.

Lee
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Robert E Morey
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Post by Robert E Morey » Sat Feb 06, 2010 6:51 pm

Adrian,
That looks like perfect speed, now to connect to sound and you will be set. Looks like a very simple set up that would work for most tanks.
Bob

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Allan Richards
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Post by Allan Richards » Sat Feb 06, 2010 7:12 pm

Adrian,

Thats a nice little recoil unit, if you connect the servo to a non proportional channel it won't be difficult to manually synchronise the sound and movement if you fit either the Benedini unit system or a Tamiya system. For my Sherman I bought a Tamia Sherman kit and used the electronics then sold on the Kit as a static model on e-bay. I got a good price so the sound system came very cheap and it also has a muzzle flash that you can mount in the gun as well.
Allan Richards

Nick Farrugia
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recoil unit

Post by Nick Farrugia » Wed Aug 04, 2010 7:31 pm

Hi adrian
i like your recoil system it looks very smooth you have done a great job repairing it and putting it back into working order.
do you think a system like that would work and fit in my pz111.
great job
regards
nick

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Adrian Harris
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Post by Adrian Harris » Wed Aug 04, 2010 10:14 pm

Hi Nick.

The Panzer III almost looks like it was designed for a system like this :wink:

The main barrel is already drilled and would just need tapping for the end bolt.

The Sherman barrel took a bit of cleaning up to remove the tight points but once it has run for a while it smooths itself out.

Adrian.

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