The Shell Load powder measure packs unparalleled powder-measuring accuracy in a compact package. The Shell Load is an effective, accurate powder-measuring tool. The accuracy is between 0,02 gn - 0,05 gn with fast dosage under 5s per dosage.
Precision Accuracy The hopper holds amount of smokeless powder for about 200 - 300 rounds, and can dispense anywhere between 0-1000 grains with a +/-0.05 grain accuracy.
LCD Display This one-piece unit features an LCD display that ensures accurate data input.
Firmware functions:
- Automatic calibration of the keyboard on the first boot,
- Automatic scale calibration by any mass of the weight set for example 10g weight / 20g weight,
Menu that allows user to set the following functions parameters:
- Ability to save 10 different configurations depending on the type of ammunition and gunpowder types in relation to the weight that we want to achiev,
- Ability to set the Units Grains (Gn) / Grams (g) as a default value to take measurements,
- Recalibration Shell Load Scale,
- Enable - Autotare,
- Set point when Shell Load Scale shoud start to dosing in more slowly way and more accurate to get finall dosage,
- Set the point when Shell Load Scale shoud start dosing super slowly way and in maximum accurate way to get finall dosage,
- Set the Fast dosing speed,
- Set the super accurate slow dosing speed,
- Set the tolerance value that is acceptable by user / Maximum weighted dosage deviation,
- Set timout for dosing,
- Set compensation value,
- Reset to defaults,
- Ability to upgrade firmware.
Dashboard:
- Set the dosage to weight (gn/g)
- Current actual weight of the dosage,
- Tare Shell Load manually,
- START/STOP Dosing,
- Information about:
- Dosing process Finished returning OK,
- Dosing process Finished but weight is Overdosed,
- Dosing process took too long and give an error of Timeout.
What is needed:
A) You have to print on 3d Printers in two technologies SLA / FDM or just on SLA Printer:
Firstly Print 3 main components:
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On SLA/FDM Printer with the highest possible tolerance
- BASE,
- COMPUTER CASE,
- SCALE
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ONLY on SLA PRINTER !!! (Don't Print on FDM printer this can generate and accumulate electrostatic charges, leading to ignition of gunpowder.)
- FUNNEL,
- MOTOR GEAR,
- PAN,
- POWDER TUBE,
- SNAIL.
-
Electronic / Firmware
The main computer unit is using Arduino with specially dedicated hat, with all connectors that you need and uploaded firmware.
The rest of electronic / mechanicall items that will be needed:
Electronic Parts for Shield:
- 1x Arduino Uno
- 1x Loadcell 50g (High accurate) / 100g (Normal accuracy)
- 1x HX711 Modul
- 1x LCD Display 1602 with I2C Interface
- 1x 5 Buttons AD Key Pad
- 1x Buzzer (active high)
- 1x step-down DC Mini360 LM2596 (SHOULD BE SET EXACTLY TO CONVERT 12v->5v)
- 1x DRV8825
- 1x NEMA17 Stepper Motor
- 1x Capacitor 100uF min 12V
- 2x Diode 1A
- 1x DC Plug 5,2x2,1mm
- 1x Power Supply min 12V 1A with Plug 5,2x2,1
- 1x calibration weight (5g / 10g / 20g it is relevent what you choose, everything will work),
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Make a SHIELD for Arduino THE SHIELD: https://aisler.net/p/MCQLSMDE
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Upload the firmware from this site.
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Screw everything :)
SCREWS:
- 19x M3x06 / For main computer TOP and all internalss (LCD, KEBOARD, MAINBOARD), Scale TOP.
- 2x M3x16 / For Loadcell mount,
- 2x M3x25 / For mounting Boul to Loadcell,
- 4x M3x8 / Bottom of te computer unit,
- 4x M3x12 / NEMA17 MOUNT,
- 1x M3 screw tap
Logic diagram of cable connections:
Below Accuracy proof of the Shell Load v2.0 - Click it to watch.
Below calculation of measures as a statistics:
- Have a lot of fun with it :)
If you think this project is great and you want to support us, give us oportunity for further developemnt. Click on the button "sponsor this project" - on the right side of this page
Thank you for all your support !!!