- #3dlabprint spitfire retract gear optuin full
- #3dlabprint spitfire retract gear optuin code
- #3dlabprint spitfire retract gear optuin plus
To sense limits, I plan to use the increase in current when it reaches both ends, rather that limit switches and/or a feedback pot. and the ones I have were purchased from Īs for the electronics, you certainly could use scrap servo parts but there is really no reason to make these "proportional", using a feedback pot. This allows me to spin my 4-40 rod (that drives the retract actuator) at such a speed that it takes roughly 4-5 seconds to retract or deploy. Sanyo gear motors they are, with a 50:1 ratio. A current sensor would still be needed I think. That would work well for everything except the gear getting jammed.
![3dlabprint spitfire retract gear optuin 3dlabprint spitfire retract gear optuin](https://i.ytimg.com/vi/Ztygn--BsjI/mqdefault.jpg)
If Im understanding you thats a cool suggestion! Oh wait - thats what the linear pot is for?
#3dlabprint spitfire retract gear optuin full
These are going to need to turn several full 360 degree revolutions to go from UP to DOWN. Im not sure Im following you on the servo parts use. You can program the endpoints with your transmitter. Instant proportional retract mechanism that can plug right into your receiver. Seal the servo board with heatshrink and some hot glue. Remove the potentiometer and wire in a new 5k linear potentiometer that is attached to the nut of the retract mechanism. Remove the motor and wire in the new gearhead motor. Different gear reductions are available.įor the electronics, just dismantle a standard size servo. Its a fairly common antweight (combat robot class) drive motor. There are cheaper suppliers if you want to buy in bulk. I'm certain these are probably model-specific. The other option is to provide various cylinder of various sizes and various threaded holes for the threaded control rod.
![3dlabprint spitfire retract gear optuin 3dlabprint spitfire retract gear optuin](https://3dlabprint.com/wp-content/uploads/2015/04/spitfire_picto.jpg)
I'll psot some oics of what I am talking about. I'm curious is any one knows the thread/size of this controlling rod, as the electric retract mechanism will need to use the similar threaded rod (avoiding having to re-tap the steel control cylinder).
![3dlabprint spitfire retract gear optuin 3dlabprint spitfire retract gear optuin](https://p11.secure.hostingprod.com/@hobbypartz.com/ssl/pimages/93A252-SpitFire-Camo-KIT-ERetract/700/93A252-SpitFire-Camo-KIT-ERetract-24.jpg)
usually with red loctite to lock it in good). The air cylinder's rod, that extends or retracts, is then attached to this steel cylinder (the rod threads into the steel cylinder. My Robarts use a steel cylinder that rides along to CNC slots milled into the two sides of the mechanism, which in turn rotates/locks the gear up and down. I'm curious in regards to the type of mechanics that is used which pulls/pushes the mechanism. I also need a little help with some other gear that is out there, which I don't have in hand to observe. got some ideas to share but I'm not a big-time CAD guy. and once I get these 630s mod'd, I'll try to post some details/pics.Īny one else looking to get involved in working out the CNC/manufacturing details? Īs a minimum, a clam-sheel style aluminum case for the motor would need to be designed. I hope to find some time this week to tinker a bit with my 630 Robart air-retracts. I'm really surprised ppl like Robart has not started selling their gear in electric versions. a simple air cylinder replacement sounds like the easiest and most economical solution. there really is nothing wrong with current retract manufacturing Co. please PM.Ī replacement for the air cylinder sounds like the way to go. I am more of a small DIY parts guy (supply small elec gadgets, kit parts, etc.) so if any one else is interested is a possible partnership of some type. I also pondered the idea of auto retracts where when the aircraft (controller) senses altitude (via sensor) and when a preset altitude is reached, the retracts automatically are triggered, bringing up the gear.
#3dlabprint spitfire retract gear optuin plus
Plus it probably wouldn't be too hard to have one servo controller board control MANY servos for various applications (maybe even with onboard options such as speed, stagger, delay, etc.
![3dlabprint spitfire retract gear optuin 3dlabprint spitfire retract gear optuin](https://wheelspin.s3.eu-west-2.amazonaws.com/img/FS-PO108_x.jpg)
not only to save space in/on the retract, but to also protect the controller from the elements, sheilding it inside the aircraft. Right now, I'm thinking of seperating the controller from the mechanism.
#3dlabprint spitfire retract gear optuin code
Some PIC code will also have to be written but should not be all too difficult. I ordered a sample chip (Freescale MC33887) and will experiment more when it comes in. It would also stop any time it senses an increase in current due to unexpected binding (i.e. my idea of a current sensor (built into H-bridge chip I plan to use) will hopefully allow me to sense increase current at both ends of throw. Looks good so far.just don't forget to add a torque limiter or such so that if the gear do hang up somehow, they shut down rather than burn out.or is that what you mean when you mention a current sensing circuit?