Search found 746 matches

by mobile chernobyl
Wed Dec 03, 2014 1:04 am
Forum: Ammo & Parts
Topic: New Type of Coil Driver? (Hall Effect Inside)
Replies: 2
Views: 847

Re: New Type of Coil Driver? (Hall Effect Inside)

Just briefly looking over your concept (So what I'm about to say may have already been considered and may be completely bunk given your scenario) - have you considered using a variation of the ZVS (Zero Voltage Switching) Style drivers used for flyback coils? They work in a semi similar manner where...
by mobile chernobyl
Tue Nov 18, 2014 4:13 pm
Forum: Pneumatic Cannons
Topic: No-seal pneumatic cartridge.
Replies: 5
Views: 1037

Re: No-seal pneumatic cartridge.

The design certainly has it's benefits - one of the most notable will be consistency. A professor was leading a project for Engineering seniors in my school - and I asked them why they picked a similar design for testing - repeatability was their claim. They were designing a kinetic energy delivery ...
by mobile chernobyl
Tue Nov 18, 2014 10:57 am
Forum: Off-Topic Hobbies
Topic: 3d printer possible backlash?
Replies: 5
Views: 1620

Re: 3d printer possible backlash?

Similar to Sudpuzzer's request - what printer, firmware (version) and slicer program are you using? Like what sudpuzzer was saying - make sure your drive mechanisms are tight and true - but not overly tight as that can cause missed steps and completely ruin your print. - there are guides and general...
by mobile chernobyl
Sun Nov 09, 2014 6:20 pm
Forum: Pneumatic Cannons
Topic: Air volume from tank to chamber
Replies: 4
Views: 865

Re: Air volume from tank to chamber

That is a safe approximation - and makes a lot of sense if you think about the vast inequalities in volumes! That .8 after 6 won't yeild a 100psi shot either - so in reality you're only getting 6 full power shots out of that tank. Not many people use paintball HPA tanks and expect any type of rapid ...
by mobile chernobyl
Sat Nov 08, 2014 8:39 pm
Forum: Pneumatic Cannons
Topic: Air volume from tank to chamber
Replies: 4
Views: 865

Re: Air volume from tank to chamber

P1V1 = P2V2 will get you the [basic] answers you need! Set up a simple excel (or google spreadsheets, i.e. free) calculation for one instance, then click and drag it down to figure out when you're at the point of no return (i.e. your tank pressure = chamber pressure). Math and Ballistics pretty much...
by mobile chernobyl
Fri Nov 07, 2014 10:51 pm
Forum: Off-Topic Hobbies
Topic: BQ prusa i3 3D printer
Replies: 32
Views: 3711

Re: BQ prusa i3 3D printer

look on the reprap forums for the "turkey oven bag" trick for creating a heated/isolated enclosed area - pretty cheap way to go about it!
by mobile chernobyl
Fri Nov 07, 2014 3:20 pm
Forum: Off-Topic Hobbies
Topic: BQ prusa i3 3D printer
Replies: 32
Views: 3711

Re: BQ prusa i3 3D printer

lol In reality that will be perfectly fine - the heated bed really only has any thermal significance on the first 1-3 layers depending on your layer height settings. My next 3d printer is going the way of fully enclosed with thermal control of the enclosure itself - that is really what should be hap...
by mobile chernobyl
Fri Nov 07, 2014 11:20 am
Forum: Off-Topic Hobbies
Topic: Power of our airguns/airsoft.
Replies: 3
Views: 755

Re: Power of our airguns/airsoft.

Very cool! Good job using one of the Airsoft BB's I assume! I was always amazed when DYI would post images of the energy transfer possible in some of his creations using airsoft BBs! KE is KE though!
by mobile chernobyl
Thu Nov 06, 2014 11:00 pm
Forum: Off-Topic Hobbies
Topic: BQ prusa i3 3D printer
Replies: 32
Views: 3711

Re: BQ prusa i3 3D printer

At that size - you will need a relay to control the power going to it. Just look for a heated bed relay. You will send power directly from your 12V power supply to the relay, and then wire the relay control directly to your controller board (usually an arduino mega style board sandwhiched to a RAMPS...
by mobile chernobyl
Mon Nov 03, 2014 12:08 pm
Forum: Off-Topic Hobbies
Topic: BQ prusa i3 3D printer
Replies: 32
Views: 3711

Re: BQ prusa i3 3D printer

Talk to poland spud! I would wager on using an Xbee - arduino combo. There are so many options out there now and for under $300 you can have something really cool! 3D printing is a good option for making hubs (for the carbon tubing) for smaller quad copters and planes - if you want real durability y...
by mobile chernobyl
Wed Oct 29, 2014 10:33 am
Forum: Pneumatic Cannons
Topic: 2" bore rapid fire airgun
Replies: 7
Views: 1165

Re: 2" bore rapid fire airgun

rapid fire 2" hybrid.

(just putting it out there :) )
by mobile chernobyl
Thu Oct 23, 2014 1:04 pm
Forum: Pneumatic Cannons
Topic: QEV vs homemade piston valve
Replies: 11
Views: 2639

Re: QEV vs homemade piston valve

Like others have said before - after 3/4" - the QEV is going to be more expensive for sure! It's not always the case that you get a adequately sealing and robust piston valve constructed on your first try. I had a coaxial 2" cannon fracture (explode pretty much) from inadequate design earlier on in ...
by mobile chernobyl
Tue Oct 21, 2014 2:07 pm
Forum: Off-Topic Hobbies
Topic: BQ prusa i3 3D printer
Replies: 32
Views: 3711

Re: BQ prusa i3 3D printer

If your bed isn't heated (which, if it was intended to primarily print PLA it usually isn't) it will be really easy! Just be sure not to leave it on for like half a year - the adhesive in masking tape is really only rated for like a month max (for easy removal) after that it starts to dry out and le...
by mobile chernobyl
Tue Oct 21, 2014 10:34 am
Forum: Hybrid Cannons
Topic: large burst disk hybrid build(Update September 2017)
Replies: 62
Views: 8355

Re: Possible large burst disk hybrid build(Update with video

This is so cool dude.

I wanted to build something on this scale for so long!

Plan on trailer mounting it if you haven't already!