It was good in a way to have break from Mendel last weekend particularly as the ground outside is frozen solid this weekend.
As I have re thought the design. First I will remove the two extra Nylon corner blocks on the bottom bar of the two A frames they are used in a real Mendel.. my lazy / simplified design they are now not required.
I have cut 2 MDF plates 2 off of 150mm x 60mm X 12mm and 2 off of 90mm X 60mm X 12mm for Z axis.
Finding that I did not have along enough belt I found a little draw with some of these Geeenweld gears for the Extruder V1 its a pack of 5 for £1:30.
Screwing one gear through the threded rod hole then positioning other meshing with it. I got the center mark to stick my photo copy of a stepper motor on. Drilling out the tiny hole in one gear to 5mm so I could screw it to the brass hub from Conrad means ~I can fitt it to a stepper.
First I thought I would keep this true to Mendel so I drilled the other two gears out to 8mm big mistake the colar causes the drill to run off center here is the first experimental result.
Making a few diffrent machines ~I also did not have enough 8mm bar but I did have 8mm tube that a 6mm bar fits I used tube on Bertha CNC so I know this works.
So to regain a concentic hole I found 6mm penny washes fited the gear center perfectly one each side of gear removes wobbly gear effect the skate bearings then needed to have a skate bearing insert to reduce the 8mm hole to 6mm great problem solved no need to use belt for Z axis just two cheap steppers.
Final assembly picture
My X axis is about 10mm wider than the printed parts. The Z cartridge is made from 1off 97mm X 84mm x 6mm the 2off X end plates are 62mm x 84mm 6mm.
I have not made proper drawings yet as it was a simple process of positioning the bits and holes to suit I have set the Slider 30mm from the Screw drive on both sides of the Z axis. To maintain the alignment I drilled these holes out using a 2.8mm drill then drilled the bigger holes.
Just a few parts left to make now.. the build base carridge to mount the build base madelast week and the Z axis drive and slider/bearing mounting board.
|From Blogger Pictures|
This an ongoing post through out Saturday 19 December pictures to be added.