Revision as of 19:39, 13 May 2020

Build

For the bed, because bed holder carriage nut catchers are printed upside down, best way to smooth is using a longer bolt to suck in a nut to clear the excess plastic. Possibly a different production engineering (machine redesign or part redesign) can solve the dirty nut holes

Bed itself is about 24 lb:
- 17x17" -1/16" plate
- 9' of 2x1/16" strip = all of 1/16" is 10 lb
- one 1/8"x18"x18" plate = 11.4 lb
- Rods - 2 lb (8' of 8 mm)
- Insulation - at most 0.5 lb from D3D_v20.04_Calculations
6x6" plates of 1/8" steel are 1.3 lb each
How many can we lift?
It should be, based on former results - 14 lb based on D3D_v20.04_Data_Collection#Bed_Weight_Holding_Capacity because we have 2x the motors, 2x the weight, and excess hold was 7 lb, so with double motors this should go to 14.
Data:
- 4 plates (5 lb)
- 6 plates (8 lb)
- 8 plates (11 lb)
- 10 plates (13 lb)
- 12 plates (16 lb) No. Went up <1" then dropped.
- 14 plates (18 lb) No. Went up a little then dropped.
- 16 plates (20 lb)

RAMPS 1.4 doesn't handle 2+2 series+parallel z motors. It is fine to drive 2 in series - bed lifts. Adding the other side just causes skipped steps.

Hysteresis - at 14 ambient, set to 55C goes to 82C.
Set to 99 at 16 ambient - temp goes to 112 on second cycle.
Set to 135. Parts of bed bubble up. So put metal plate on to keep thermal expansion down, baking in the bed with glue to bed contact. At 120, temp went down to 117 after putting on 33 lb of plate. 25 plates of 1.3 lb.

@@ Line 33: / Line 33: @@
 #Hysteresis - at 14 ambient, set to 55C goes to 82C.
 #Set to 99 at 16 ambient - temp goes to 112 on second cycle.
+#Set to 135. Parts of bed bubble up. So put metal plate on to keep thermal expansion down, baking in the bed with glue to bed contact. At 120, temp went down to 117 after putting on 33 lb of plate. 25 plates of 1.3 lb.
 =Links=
 *[[D3D v20.04.27]]