Packing by bag for the Popular Mechanics Futuretech 2014 show in Cape Town, South Africa 10 Oct 2014. We will have a Morgan and a Beast on display…
Everything is in place at the new factory in Centurion after a brief but intensive move…
Will post some photo’s tomorrow!
I was asked this question again, and this was my reply:
Disclaimer: The calculations were done quickly on a calculator and may have slight rounding errors – but not to a factor of 10!
The large wheel radius is 75mm making circumference = 471mm
The pulley on the motor is typically T2 20 or T2 16: 40mm or 32mm
Ratio is thus 11.78 or 14.72
Given a step size of 0.9deg, and 32uStep an electronic step is 0.028125 degree
With the ratio, that becomes 0,002387521 or 0,001910666 degrees on the large wheel.
Lowest possible resolution would be at full arm extension 90degrees to the extended direction, which is less than 150mm+150mm from the SCARA tower, but for simplicity let’s make it 300mm.
Circumference of that symbolic circle would be 1885mm, making the single step lowest resolution movement 6.282mm*0,002387521 (40mm pulley) which is 0.015mm. This is smaller than the effect of filament variation or room temperature variation on your print…
Morgan Pro has a advertised specification of 100micron resolution – which means it will definitely pass the specification and will probably achieve more by a factor of 9 or 10 in terms of movement alone
With the smaller pulley this is even higher….
Enough calculations for now
Morgan and RoboBeast will soon be manufactured in the same plant. This will be the driving force behind one of the largest bespoke print-farms in South Africa. Robohands, Robobeasts and Morgans will roll of the plant in harmony.
Richard van As (Robo Rich) is currently in the USA, setting up the largest print farm at the College of the Ouachitas. in Arkansas
They are fixing up and calibrating more than 50 (brand new) formerly troublesome makerbots to make Robohands… and other things while the opportunity presents itself
You may have noticed some changes on the Morgan Site… A certain good looking 3D printer seems to dominate the page…
Richard van As helped make this metamorphosis possible, by subtly suggesting material substitutions, hinting at colour choices, and not so subtly bugging Quentin to get his ducks into a row and redesign Morgan to be more robust, easier to build and manufacture and to be very easy on the eye… Every good wunderkind needs a good mentor.
Thanks to House4Hack that brought these two together…
All grown up and ready to go.
Reprap Morgan (Thomas) Pro
Something weird happened on my blog’s server again today.
My hosting provider fixed it best they could… only lost the photos of the motor mounts post.
Will fix it tomorrow.
At least the forums are ok!
Morgan has gone through a lot of different takes on all of it parts over the design time, but none as many as the motor mounts. The new mounts are easy to print, and rock solid – no flexing.
Start by printing the files, and collecting he pieces required. Files on Morgan master get the mk5 motor mounts. You will need 2 to 4 M3x50 screws to attach each mount (may vary depending on the motors you have available: based on 47mm high motors.
In order to ease calibration a small change to the firmware was required. When issuing M36x commands, soft end-stops are disabled to permit movement of the arms into the calibration positions.
Never tell a hacker that something is impossible to do. This is the story of the RepRap Morgan, the journey towards personal rapid protoyping, and how dreams can be realized – by patience and a good dose of stubborn stupidity. It is also the cribnotes you need to fast-track builing your own Morgan