D3D v20.04 Calculations: Difference between revisions
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*with 1/2 diameter pulley, that is about 20 lb driver force - about right. | *with 1/2 diameter pulley, that is about 20 lb driver force - about right. | ||
*Total lift is 40 lb from both sides | *Total lift is 40 lb from both sides | ||
*Weight of bed - 7.5 lb for top and bottom, 3.5 lb for sides. Rods - . | *Weight of bed - 7.5 lb for top and bottom, 3.5 lb for sides. Rods - .26 lb per foot, we have 3 feet - 1 lb more. Insulation - maybe 1.4 lb / cu ft [https://www.google.com/search?q=weight+of+rock+wool&oq=weight+of+rock+wool&aqs=chrome..69i57j0l5.4148j0j7&client=ubuntu&sourceid=chrome&ie=UTF-8]. We have 1/6 cubic foot, so only a quarter pounder of fluff. | ||
**'''Total bed weight: about 12 lb''' | |||
*Bed volume of 1440 cu in, is 25 lb of max plastic mass that can be printed (assuming 50% full build plate, the maximum foreseeable print weight based on 100% infill. | |||
*Density of plastics is about 1 g/cc. [https://www.stelray.com/reference-tables/]. So 1 liter is about 1 kg. | |||
*Thus, if steppers can hold 25 additional lb, that would suffice for any print whatsoever. Let's test. See [[D3D v20.04 Data Collection]]. | |||
*'''turns out that at most about 7-10 lb can be lifted in addition to bed weight''' using 2 stepper motors in parallel with RAMPS 1.4 | |||
=Counterweight= | |||
*Steel block, 2x4x3 inches (24 cubic inches) - weighs 6.7 lb. Need 2 of these as counterweights - these could counterweight the bed fully.e | |||
*4x4 block, 1" thick - weighs 4.5 lb | |||
*Concept of slab counterweight on 2 rods - 4x4" with 12" bed printer (18" axes) - [[File:counterweight_model.fcstd]] | |||
=Links= | |||
*[[D3D v20.04]] | |||
Latest revision as of 18:47, 7 May 2020
Bed Weight and Lifting Capacity
- Motors advertised at 84 oz in or 5.25 in lb
- with 1/2 diameter pulley, that is about 20 lb driver force - about right.
- Total lift is 40 lb from both sides
- Weight of bed - 7.5 lb for top and bottom, 3.5 lb for sides. Rods - .26 lb per foot, we have 3 feet - 1 lb more. Insulation - maybe 1.4 lb / cu ft [1]. We have 1/6 cubic foot, so only a quarter pounder of fluff.
- Total bed weight: about 12 lb
- Bed volume of 1440 cu in, is 25 lb of max plastic mass that can be printed (assuming 50% full build plate, the maximum foreseeable print weight based on 100% infill.
- Density of plastics is about 1 g/cc. [2]. So 1 liter is about 1 kg.
- Thus, if steppers can hold 25 additional lb, that would suffice for any print whatsoever. Let's test. See D3D v20.04 Data Collection.
- turns out that at most about 7-10 lb can be lifted in addition to bed weight using 2 stepper motors in parallel with RAMPS 1.4
Counterweight
- Steel block, 2x4x3 inches (24 cubic inches) - weighs 6.7 lb. Need 2 of these as counterweights - these could counterweight the bed fully.e
- 4x4 block, 1" thick - weighs 4.5 lb
- Concept of slab counterweight on 2 rods - 4x4" with 12" bed printer (18" axes) - File:Counterweight model.fcstd