I've developed a master plate for my hobby woodwork (approx. 40x40x40 mm, see the figure). Its goal is to allow a straight angle while drilling 40 mm parallel bars. Four vertical holes are used to fix a 6 mm drilling bit in the perpendicular position. I use a low-power screw gun for drilling.
I ordered this part and I am mostly happy with the result, but I think I've failed to choose the right material for printing. I started with ordinary ABS (100 % filling) and see the following issue with the tool. After a couple of dozens of drilling, the main holes become elliptic which leads to worse precision. I am not sure about the reason:
- Sometimes, I see plastic chips, but quite rare.
- I think that the drilling friction can make the material more flexible due to a raising of temperature, leading to the deformation of the holes while they are hot and under mechanical pressure.
I believe that this issue can be solved by choosing the proper material to produce the tool. Unfortunately, I've failed to find a good answer by Googling it on my own.
What would be a general recommendation for choosing material for such kinds of tools?