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02-28-2020, 02:56 PM | #1 |
Rock Stacker Join Date: Apr 2008 Location: France
Posts: 71
| try to make a new mini - WIP
Hi guys, first of all, i appologise that my frenchy bad english sucks so please be kind Here is a new project born in my head few months ago Obectives: - use commercial parts - low cost of build (as possible) - OD/UD - Wrcca rules ready Difficulties: - chassis must accpet a gearbox made with standards parts and ratio closed to the original losi mrc) - axles with standards parts to accepts actual lockout and popular steering setup - front axle with 1 low profil servo, esc, rx, lipo 2s 130mah - find enought space components choice: - bevel gears from ar44 (30/8 on rear and 27/8 on front) - standard size 380 brushed motor - chassis / skid / plates : 3mm lasercut delrin - gearbox with mod 0.5 and main gear from sakura 1/10 like - Axles will be 3d printed PA / SLS (sculpteo) ---------------------- few months ago, i started with that first design, inspired by Ventru shafty from my friend Pat from PsychoPat' Crawler Parts. cad project: few days later... and the gearbox the gearbox was ok but axles for smal gears was to thin (2.5mm diam) and the ratio was wrong because of a stupid error of mathematics (shame on me) Axle mod consist to cut tubes, make upper link riser system for rear, and a servo plate for front. For both axles, need to built a 3d printed part to fit on c-hub (from ar44 or AR60) first try, first mistakes after making that shot i realised that chassis design wasn t good because of some parts can t be resized from 1/10 to 1/18 end of the first release ------------------- 2nd release was like a reboot... the small 3d part for axles was too thin so i tryed with full printed tubes nice but... but the screwed part of tubes were not enought strong... then, lets try to print full axles, more strong Chassis and gearbox : fully re-draw to : - accept bigger gears and shafts (5mm) from standards parts from industry or rc parts - accept 2 type of shocks mounting screws (M3 or M2.5 for many chineese lowcost shocks) - use standards bearings - place motor inside gearbox - enable to flip motor front to rear in gearbox and left to right side - optional : if it fit, od/ud built-in gearbox Axles are designed, front will be for ar60 c-hub and rear with home made lockers Here we are ! i m waiting postman some news as soon as possible Last edited by truespace; 03-02-2020 at 07:25 AM. |
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