Thread: Hello and here I go
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08-11-2012 #4
Ok first why C channel.? Box section is cheap and much stronger.!
Would strongly urge you to stay well away from Angle iron/V-groove bearings route if your mainly cutting wood.? They stick and bind with the dust and resin build-up. It's one route you will regret I promise you that. Supported round rail from china will work out far less hassle give much better performance and probably cost less money in the end. R&P is ok for this size machine but it's very inefficient compared to other methods and any friction in the bearings will just compound the issue.!!
Some of the issues with R&P is driving both sides often means slaving motors so the design, alignment and quality needs to be good otherwise any binding or sticky-ness will stall a motor resulting in racking the gantry and potential damage. This means making sure the motors are running well below there corner speed while cutting ensuring the most torque is available.
Because the pinion dia will be large you'll need to gear the motors at least 2:1 or 3:1 to bring the pitch down to allow a decent resolution and help raise torque to combat the inefficiency's of R&P.
This means the relation ship between motor/drive/voltage choice to give a good corner speed along with pinion Dia/gearing to allow decent torque/resolution is important you get right. It also means the machine frame and build quality have to be first rate and any corner cutting soon shows has you have very little wiggle room due to the sticky nature of R&P and if shoddy will quickly Rob power resulting in stalling and head thrashing sessions.!!
IMO a wood frame hisn't a good idea for R&P due to movement which again will just compound to any inefficiency's already there.!!
Please don't think I'm trying to put you off R&P just pointing out some of it's quirks.!! . . . . I am 110% trying to put you off V-bearings/angle iron thou.!! . . DONT DO IT.
Hope this helps.!
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