That's the tap I got. If you go slow with the step bit, you'll be ok. A step bit in my experience is much, much more forgiving on cracking acrylic than a regular drill bit. I'm more scared of cracking when using a straight bit, even when starting from small bit to a big bit.I can't wait to do it, but the tap bit is delayed and won't be here until 8th ;-(
I tried the step drill bit today on starboard, which feels soft and pretty easy to drill. Wonder how different it is to drill acrylic lid. Did you feel danger of cracking when drilling?
BTW, is this the right bit? It says "Pipe Tap"?
Yeah, the faster the drill bit spins the more friction builds up and you end up melting. Too much pressure and it will crack. It’s a balance so good to go slowly but with a sharp bit. It also helps to have a sacrificial piece under it to help support it evenly as you drill. Plywood works pretty good for this. Lastly is the positioning of the hole. Drilling closer to the edge is always more prone to cracking. If you have a practice piece I’d recommend practicing first. I’ve never used a stepper bit so it’s not necessary to be successful but I have also cracked my fair share of acrylic while drilling.I think the two biggest concerns with cracking acrylic are overheating it and the drill bit catching an edge.
I think starboard is HDPE, which is softer and less brittle than Arylic.
You shouldn't need to shave down the 1/4" connector as long as the extension tube you add to the input of the recirculating pump is lower than the 1/4" connector. A little air in the reactor won't add to any noise as long as it doesn't get into the pump.Done!
The acrylic lid feltmuch harder and “dry” when drilling and tapping. Hard to tell what is the optimal drilling speed. Step drill helped.
First time doing tapping. Difficult to keep the bit stable at the beginning before the bit catches the material good. Toward the end, resistance to turning is quite strong, i was worried I might crack the lid.
The 1/4 connector now extends slightly below the lid. This leads to a pocket of air remaining in the reactor. I may give it a shave next time so it flushes with the wet side of the lid.
These days new cal reactors have the circulation pump taking water from the side of chamber. Better design than mine.
“Fallback” is only the state set when the EB loses connection from the head.How did my apex codes for cal reactor ph probe allowed ph=5.9?