Notices
RC Tanks Discuss all aspects of rc tank building and driving here!

Stug III recoil

Old 10-13-2008, 02:37 PM
  #1  
971wright
Senior Member
Thread Starter
 
Join Date: Dec 2007
Location: nelson, UNITED KINGDOM
Posts: 679
Likes: 0
Received 0 Likes on 0 Posts
Default Stug III recoil

Hi guys just taken the recoil apart to see if its posible to get it working correctly and the answer is I think it is the recoil unit motors back then springs forward well Have a look at photos the gear that winds the barrel forward needs a slight modifiction one is to stop it going all the way back so the gear can engage the other is to modifie it so it moves a little further forward so the gear will disengage this will allow the gun to recoil then reverse the motor conection so its running backwards so when you hit the fire button the motor will turn to disengage the barrel the spring will pull the gun backwards then the motor will engage and push the barrel forward.

I think it will need filing where the screwdriver is pointing in 4 places
will try tommorrow and let you know
Attached Thumbnails Click image for larger version

Name:	Cz80021.jpg
Views:	226
Size:	77.7 KB
ID:	1051015   Click image for larger version

Name:	Yt61261.jpg
Views:	181
Size:	78.7 KB
ID:	1051016  
Old 10-13-2008, 02:58 PM
  #2  
tankman
 
Join Date: Apr 2008
Location: NewportGwent, UNITED KINGDOM
Posts: 224
Received 15 Likes on 10 Posts
Default RE: Stug III recoil

Nice one, please keep us posted on this mod. All the best for now
Alan
Old 10-13-2008, 05:43 PM
  #3  
darkith
 
Join Date: Feb 2007
Location: Fredericton, NB, CANADA
Posts: 664
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Looks interesting...This would be a really nice improvement.

D.
Old 10-14-2008, 09:31 AM
  #4  
971wright
Senior Member
Thread Starter
 
Join Date: Dec 2007
Location: nelson, UNITED KINGDOM
Posts: 679
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Hi Dave got it to work spring back and motor forward looks better but will need to fit limit switch to stop gun when it returns to normal length I Have a small micro switch just have to work out how to wire it .

regards pete


the mechanics were easy its the electrics that leave me stumped
Old 10-14-2008, 01:46 PM
  #5  
borealis
 
borealis's Avatar
 
Join Date: Jan 2007
Location: San Paolo Solbrito, ITALY
Posts: 1,486
Likes: 0
Received 10 Likes on 8 Posts
Default RE: Stug III recoil

You might use the same principle as Asiatam's recoil units: use a normally closed switch which replicates the negative connection of the recoil motor, and connect it directly to the battery negative. Put the switch as to open it when the barrel is back in resting position.
That way you just need a short current pulse to move the last gear, disengage the barrel theeth making it spring back, and close the switch. The closed switch will continue feeding the recoil motor, making the last gear engage the barrel and move it into resting position, at which point it must open the switch, stopping everything.
Old 10-14-2008, 03:32 PM
  #6  
gigantohawk
Senior Member
 
Join Date: Dec 2007
Location: HuddersfieldWest Yorkshire, UNITED KINGDOM
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Hey Pete well done for daring to delve into the recoil unit. What you suggest seems to make a lot of sense. Between you and borealis you should get a fix working there.

p.s. Did I see a pic of the stug recoil unit that showed a spring loaded switch already in there ?.

NIck.
Old 10-14-2008, 03:56 PM
  #7  
971wright
Senior Member
Thread Starter
 
Join Date: Dec 2007
Location: nelson, UNITED KINGDOM
Posts: 679
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Hi Nick the orginal recoil unit works backwards winds back with motor then springs forward so with a little bit of filing to the stops inside the unit turn wires round on motor change spring round 180 degrees now just to sort limit switch wiring it springs back and motors forward stops at end of stroke just to sort out pluse to start it.
Had to take it out to fit focus tube for I.R to make sure the range and direction are right so thought I would see if I could mod the recoil once this is done will put it to one side till I do the schurzen then going to have a look at my Panzer4 fit a modified BB gun changed it to recoil fit this then a new barrel got plans from Septon today so can make one now then schurzen for both panzer 4 and stug III.

regards pete
Old 10-14-2008, 04:05 PM
  #8  
gigantohawk
Senior Member
 
Join Date: Dec 2007
Location: HuddersfieldWest Yorkshire, UNITED KINGDOM
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Pete, I just thought. Couldn't you use a 3.5 mm stereo jack socket as a limit switch. Do you get my drift i.e. going open circuit at full forward position.

Just a thought.

Nick.
Old 10-15-2008, 04:16 PM
  #9  
971wright
Senior Member
Thread Starter
 
Join Date: Dec 2007
Location: nelson, UNITED KINGDOM
Posts: 679
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Hi Guys just to let you know it works after Darkith told me how to wire the limit switch now I have a proper recoil in the stug III it as spring to pull it back and motor to push it forward in other words fast bark slow forward will post pics tommorrow of how to do it .the hardest part is setting the micro switch there is not much to do just remove about 1,5mm from internal stops to allow barrel to slide a little further forward turn spring around so it pulls in opposte direction swop wires on motor to change direction of motor and add a wire from micro switch to battery negative.


regards pete
Old 10-16-2008, 04:00 PM
  #10  
gigantohawk
Senior Member
 
Join Date: Dec 2007
Location: HuddersfieldWest Yorkshire, UNITED KINGDOM
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

How's it working mate. Have you got any new pic's yet.

Nick.
Old 10-16-2008, 04:59 PM
  #11  
971wright
Senior Member
Thread Starter
 
Join Date: Dec 2007
Location: nelson, UNITED KINGDOM
Posts: 679
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Hi Guys its finished and tested works fine the only filing to do is the internal stops pointed out with screwdriver on early post you have to file about 1,5 mm off 4 stops to allow the barrel to move forward to disengage the drive gear,glue the clutch so it will disengage at end of stoke from a stationary postion when testing found the cluch would slip rather than disengage , after this swop over motor wires to reverse the motor move spring 180 degrees so it pulls the barrel backwards and fit limit switch to stop barrel when it is driven forward with the motor.The hardest part is setting the limit switch its alot of trial&error to get it just right

the wiring should be like this
Batt Positive connected directly to motor as per stock.
Batt Negative connected to NC on microswitch
COM on microswitch connected to motor
Recoil start/supply (negative) from RX18 board connected to NO on microswitch


if its worked you should see the new gearbox from Heng long its only the right one they have changed

regards pete
Attached Thumbnails Click image for larger version

Name:	Ig12384.jpg
Views:	134
Size:	78.1 KB
ID:	1053129   Click image for larger version

Name:	Id96161.jpg
Views:	132
Size:	80.1 KB
ID:	1053130   Click image for larger version

Name:	Tr50900.jpg
Views:	115
Size:	79.4 KB
ID:	1053131   Click image for larger version

Name:	Ni22983.jpg
Views:	107
Size:	82.1 KB
ID:	1053132  
Old 10-17-2008, 01:40 PM
  #12  
gigantohawk
Senior Member
 
Join Date: Dec 2007
Location: HuddersfieldWest Yorkshire, UNITED KINGDOM
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Sounds fabulous Pete. I'm just struggling a bit with the nomenclature !!. "Com" "No" etc.
Mate keep it simple, remember I'm thick as mince.

Ta,

Nick.
Old 10-17-2008, 01:54 PM
  #13  
darkith
 
Join Date: Feb 2007
Location: Fredericton, NB, CANADA
Posts: 664
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

COM = Common pin
NC = Normally closed (connected to COM when the switch is idle)
NO = Normally open (not connected to COM when idle)

When the switch is activated, NO gets connected to COM, and NC gets disconnected.
On some switches they use the COM (or C), NO, and NC labels.
Others show a diagram imprinted on the side.

D.
Old 10-17-2008, 02:11 PM
  #14  
gigantohawk
Senior Member
 
Join Date: Dec 2007
Location: HuddersfieldWest Yorkshire, UNITED KINGDOM
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Got it Darkith...Thanks Pal.

Nick.
Old 10-18-2008, 05:41 AM
  #15  
971wright
Senior Member
Thread Starter
 
Join Date: Dec 2007
Location: nelson, UNITED KINGDOM
Posts: 679
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Hi Nick If you do the mod read the other post I put on how to remove the barrel they have screws that are very hard to get at If you get stuck drop me a P.M and I will help all I can If need be will come over its only about 40 miles to your place.


regards pete
Old 10-18-2008, 01:43 PM
  #16  
gigantohawk
Senior Member
 
Join Date: Dec 2007
Location: HuddersfieldWest Yorkshire, UNITED KINGDOM
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Stug III recoil

Ok I'll try the right post this time...Sorry Debbie and I have just enjoyed a nice Rib-eye steak and wine !!!, so I'm a bit fresh !!.

Very kind offer mate...If you pop over and help me out then I'll put a nice bottle of Claret to one side for us to enjoy.

All the best,

Nick.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.