The Mini Juice Machine Mk 3

[highping]

That's looking great petercro. I like the idea of using that roller switch. Seems like it would have a nice feel to it.

I agree with the others that those metal studs shouldn't have a line of sight on each other. That's just asking for a short. One possible solution (so you don't have to move them) would be to put a plastic washer around them. This would also aid in being able to stand it on end.

BTW: Ralph is correct. It looks like that is an unprotected batt. Not a huge deal, but you should make sure your design allows for that extra few mm that a protection circuit is going to add.

[petercro]

Nice work Petercro!

I would have a very good look at your battery. It may be shorter because there is no protection PCB on the negative end. I have this battery. Notice that there is a ridge around the positive end and the negative one. The PCB is on the negative end and is shaped like a button battery. I think they just heat shrink it in there with the plastic sleeving. I am not seeing that ridge on the negative end of your battery.

Thank you for the heads up about the battery.
The writing on the battery says it is protected.
But any idiot with a wax crayon could have written it.
I have contacted my supplier and am waiting for a reply.
If I don't get a suitable answer I will dismantle one and if isn't protected.
I will get the supplier booted of ebay / paypal.
(I'm not vindictive, I just don't like getting screwed).

[Ralph T]

Thank you for the heads up about the battery.
The writing on the battery says it is protected.
But any idiot with a wax crayon could have written it.
I have contacted my supplier and am waiting for a reply.
If I don't get a suitable answer I will dismantle one and if isn't protected.
I will get the supplier booted of ebay / paypal.
(I'm not vindictive, I just don't like getting screwed).

Something else I noticed about the protected ones. There is a bit of a ridge (conductor) running from the protection circuit board (PCB) on the negative end up to the positive end, underneath the shrink wrap label. I think this allows for the PCB to measure the voltage across the battery. This is the only way it could protect against overcharging.

I tried to find a good photo of this.

I think this is the ultrafire web site. They have multiple colors, but in the 2600 mah 18650 batteries, it would appear that maroon is protected and the pretty green ones are not. Although it could be that they change colors based upon what labeling material they have laying around.

[petercro]

After seeing the mahmba 2. The Mini Mk3 looked like a box toy.
I removed all the pieces and hit it with a hammer.
Went back to the drawing board.

Talking to HighPing and MastiffMike, on how to work with plastic to form sleeker Mods, I came up with this.
It is not finished as the unit has to be glued together.
The gap between the two halves will be filled and smoothed with epoxy putty,
Then the white plastic will be sprayed black, and the copper sealed, or may just spray it all black.
Green Led installed, hand made switch in battery cap.
Screw in and out liquid bottle, fed direct into 4081 atty.
All parts from local diy shop.
dimensions, 80 X 44 X 24mm
Will take protected or un-protected 18650.


















This last pic,
The spring is totally insulated for the copper.
The battery is inserted +ve side down.
Press the copper top and the inner 15mm copper pipe hits the -ve contact.


I'm away again tomorrow, so will not be able to finish until mid next week.
(Don't want to work, just play).

[Spiker]

That looks so COOL! Great design idea! Let me know when I can order one!

[theECB]

I must say...this is one great looking Mod! Can't wait to see the finished product.

[TBM]

Looking good!

[MastiffMike]

Nice Peter! How are you tackling the switch firing when not desired (i.e. in your pocket?) Is there a way to "lock" the switch? Also, is the battery removable? If so, is the copper end just pressure fitted on? Are you going to be able to recharge without removing the battery? Looks like it could be done quite easily!

Yeah to another Petercro thread!

[petercro]

There is no master switch as such.
The copper cap switch will have a rotation lockoff on it.
The battery can be removed for charging, but not necessary.
Remove atty, hold down switch and clamp in a charger.

Mike, also,I used the same layout as the mahmba 2 for the bottle feed setup.
Push up bottle, screw in place. Brass tube straight into atty. Separate brass tube within bottle.
Works like a charm.

[MastiffMike]

There is no master switch as such.
The copper cap switch will have a rotation lockoff on it.
The battery can be removed for charging, but not necessary.
Remove atty, hold down switch and clamp in a charger.

Mike, also,I used the same layout as the mahmba 2 for the bottle feed setup.
Push up bottle, screw in place. Brass tube straight into atty. Separate brass tube within bottle.
Works like a charm.

I noticed the bottle opening were the same. I'm thinking my design might be modified to something like that (tho I still want to use a spray bottle!!!) I also like your "charge in the case" ideas and that'll solve one of the biggest issue I've had with my design, how to make it easily accessible. With charging posts I won't need in unless replacing the battery or atty! I'm so jazzed to get my juice bottle design started I've been unmotivaed to finish my springbox!

Keep the info and pics coming Peter!