Scale bracket for Simple tensile strength tester (remix of)

A remix of the Simple tensile strength tester for a different scale. I used a Goyojo bought from Aliexpress.

The battery compartment is accesible without taking the scale out of the bracket. The bracket needs to be taken off the rail though.

remix by Nando

Why a remix?

The scale used by RobertCowanDIY is different than what I have so I designed a different bracket for it.

I use this tensile tester for practical classes for a school for laboratory analists.

The Goyojo can be ordered on AliExpress. I ordered the highest rated one at 500 N. The actuator is rated 200 pound (force). 1 lbf is about 4,4 N so the max force by the actuator is 200 x 4,4 = 880 N which is more than the scale can measure. If the scale breaks at the maximum force of the actuator is to be seen. I have tested some petg and pla test samples and they broke under 400 N.

There are 4 bolts that hold the scale to the bracket. These are designed as M3 button head versions but other might work with a washer as well.

The battery compartiment is accesable when the scale is mounted in the bracket. The bracket needs to be removed from the tensile tester thought.

Rechargable AAA batteries work in the scale. But the batteries do run out fast.

Added or replace to BOM (Bill Of Materials) of tensile tester of RobertCowanDIY

- [ ] 8 x M5 x 12 mm Button Head Screw extra (same as other in this BOM for the tensile tester)

- [ ] For scale bracket to 3030 profile

- [ ] Washers

- [ ] between M5 x 25 mm and bracket

- [ ] 8 x M5 Sliding nuts extra

- [ ] 4 x M4 x 12 mm button head screw

- [ ] For scale to bracket

- [ ] Goyojo scale. I ordered the 500N

- [ ] https://nl.aliexpress.com/item/1005007211382685.html?spm=a2g0o.order_list.order_list_main.17.112f1802TvDCaV&gatewayAdapt=glo2nld

Print settings scale bracket

- [ ] print horizontal and upside down (layer lines will be longitudinal to the applied force)

- [ ] organic support on the overhangs

- [ ] support on build plate only

- [ ] … perimeters

- [ ] … infill

Feel free to experiment if you have experience. Please let us all know what you did for educational purposes.

Color function of actuator

- [ ] Black on black and red on red (actuator and power supply) moves the actuator outwards. Black on red moves the actuator inwards.