Fitting a laser as a aiming light

Discuss the good old Heng Long electronics here, whether its mods on them or anything else, it goes here!

Postby bowlingball » Tue Jan 04, 2022 4:26 pm

I checked the forum but cant see a definitive answer for this. I have a HL Sherman fitted with 7.0 controls. I have fitted a 5v laser to the mantlet to act as a targeting light. It's not meant to be accurate in a precise sense, but more for the amusement of my grandson!
What I cant see is how I can illuminate it. I note there is an "aiming light" at LED 2, is this the one I connect to? And which button/combination of buttons will light it up?
I'll be happy to post a summary of the work/outcome once complete.
I'm very new to this hobby/site, so pls bear with me if this has been dealt with elsewhere.

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Postby bowlingball » Wed Jan 05, 2022 3:01 pm

Finished the mounting of a laser sight on the HL Sherman.
Took the output from LED 2 and fed this directly to the laser, mounted in the drilled out hole in the mantlet. Pressing button B lights it up. May do a more detailed run through with pictures if there's any interest.

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Postby stu_the_flat » Wed Jan 05, 2022 4:17 pm

Yes I would be very interested. I would like to replace the defunct led on my Heng long Panzer with one.
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Postby AGKPeiper » Wed Jan 05, 2022 9:34 pm

Yes thank you. I'd also be interested in this.

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Postby bowlingball » Thu Jan 06, 2022 11:09 am

Parts used:
5v Mini laser head dot 6mm diode. Amazo £6.29 pack of 20.
22 AWG JST Plug. Amazo £6 pack of 20 pairs.
Milliput modelling resin.
6.5 mm drill
Method:
Separate the top and bottom halves of the tank. 4 recessed screws in the bottom. Separate the turret, 2 screws in the turret gear wheel.
I chose not to disconnect any wires, but worked on the separated parts while still connected by the various cables.
Drill a 6.5mm hole in the mantle (right hand side as you look at it from the front). There is already a "feature" there, but it's not functional. Take care as you drill to avoid the bit causing damage inside the mantle. Remove any plastic swarf.
Feed the wires of the laser in through this new 6.5mm hole. It's quite a snug fit but there is sufficient play to all you to true the aim of the laser beam.
Solder a JST 2pin female connector to the diode wires. (I had already soldered some additional wire to the diode wires so that it was easier to thread through.)
Plug this into LED2 on the controller. I removed the speaker to one one side to make this easier.
At this point you can fire up the tank and check the laser is working, by pressing button B. Tidy the new cable, making sure the turret rotation and gun elevation are not impaired.
Make sure the laser is easily accessible, ie is well proud of its mount, so you can get at it once you reassemble the tank.
Make up a small amount of Milliput or similar modelling clay and use this to sit the laser neatly in the mantle. I left it about 5mm proud as this gave me enough 'wiggle room' to adjust its aim.
While the modelling clay is still workable, start up the tank, fire a BB at a target you can check impact with and adjust the laser dot to be in line with the point of impact. I was aiming more for visual impact that precision.
Once the clay has hardened, paint the laser to match the tank.
Hope that helps.
Attachments
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Postby Herr Dr. Professor » Fri Jan 07, 2022 5:56 am

That laser sight is a unique addition. Perhaps others have done it, but I cannot recall seeing it here on RCTW. I bet it was fun to try to get the plastic BBs sighted in. :haha: On the best BBs to use (not the yellow ones that come with the tank) see:https://www.rctankwarfare.co.uk/forums/viewtopic.php?f=22&t=30971&hilit=white+BBs&start=40
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Postby stu_the_flat » Thu Jan 13, 2022 2:00 pm

So I've been working on mine. I want to install the laser behind the mantlet. So I have mounted it on a vice (it's been broken for ages) I sighted a target I use for fine tuning autofocus of cameras and then shone the laser down the barrel. The laser exits the unit at an angle so although the unit fits perfectly in the barrel it needs to be held a quite an angle to go down the barrel. Then I just plan to glue it to the hole where the led was holding it at the sport sighted by the barrel.

On a safety note I notice mine is quite bright the listing quoted it at less the 5mW. That would make it a class 3R laser. It is not idiot proof and in my mind more dangerous than the BB launcher. So I am putting this project on hold until I can get a second safety switch that I can mount next to the BB unit so that I can disable it if I feel necessary.

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Postby stu_the_flat » Fri Jan 14, 2022 12:47 pm

I will never drive my tank forward again! :P Still think the laser I bought is to bright. class 1 or 2 would be just as good.

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Postby bowlingball » Fri Jan 14, 2022 1:00 pm

Yes, that does look very bright. I can't see the wattage on the one I fitted, but I intend only to light it up when about to fire. Since I wouldn't be point the gun at anyone at the time, I think I'll be safe enough. I do like the laser/smoke combination, I'll have a go at that tonight.

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Postby stu_the_flat » Fri Jan 14, 2022 2:46 pm

Just if anyone is following this and buying laser here is a bit of reading to help with the safety side of things. I used to work with more powerful ones so I am paranoid about them!

https://www.gov.uk/government/publicati ... ety-advice
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Postby Tiger6 » Fri Jan 14, 2022 3:20 pm

Herr Dr. Professor wrote:Perhaps others have done it, but I cannot recall seeing it here on RCTW.

Sighting lasers are generally considered a no-no for anyone who attends club meetings or public events for the same reason as BB's are not allowed - our insurance simply won't cover their use.

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Postby bowlingball » Fri Jan 14, 2022 3:22 pm

All points duly noted. Thanks.

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Postby 43rdRecceReg » Sat Jan 15, 2022 12:28 am

Some very useful info, here, so thanks for creating the query- and for providing a solution too. :thumbup: This adds to the collective knowledge gathered by members. :thumbup:
The TK 6.0 series controllers also offer the 'aiming light' function; but as appealing as it may be, some caution would be prudent along with some research into potential hazards, before diving in. :)
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