u/Agreeable-Worker7659

I have a small but pretty sturdy hobby lathe and I'm learning to use it. Lately I was trying to cut large diameter bores into some aluminum. I have a S12M SCLCR 09 boring bar. On this website, it says that the minimum predrill diameter is 16mm. I actually drilled a ~12mm hole and somehow I was able to pretty easily make it bigger and then the boring bar somehow wouldn't be able to progress any further and it all got messy. It was really surprising that it worked its way easily for the first 20mm or so and only then it'd start getting stuck.

How's this 16mm actually calculated and does it really require that much? Unfortunately I don't have any drill that big, but I guess I could get a smaller boring bar too?

I'm looking for a router I can flash with OpenWRT or comes preflashed that has at least 2x2.5Gbit ports or 1x10gbit and 1x2.5gbit configuration as well as WiFi 6 or 7 and USB 3.0 for SSD or built-in SSD slot(s). My budget is up to $300. I was considering GL-MT6000, Qnap Qhora and Banana Pi R4. Regarding the last option, I was a bit concerned about how the WiFi chip works and regarding the other ones I've heard they also have some issues. I'm not very well oriented in this topic, so I wanted to learn from the community which option is the best or is there something I didn't even consider that works better. Thank you for your support!

I want to modify my EOS R to full spectrum and in order to prevent issues with the focusing range, I need to replace the hot mirror on the sensor with a clear quartz glass with specific thickness (around 1.6mm). Unfortunately I don't know the size of the original hot mirror. Does anyone here know what the size might be? I don't want to pay $200 for a piece of quartz from Kolari or Lifepixel because I can get it for $20 if the dimensions are known.

I recently got a used EF 35mm f/1.4L for ~360 EUR and while the autofocus spins in the entire focus range and manual focus does that too, the lens won't focus past ~4m and they can also focus much closer than the minimal 0.3m. It's as if the entire focus group physically moved inside of the lens. In other words, when I turn the focus ring manually, there's a constant focus shift all the way to the infinity symbol on the lens housing, but as it reaches infinity, it's actually at ~4m and when it's at the minimum of 0.3m, it's actually at ~0.1m.

Edit:

I tested the lens with the original eos Ef to R drop in adapter and just tried two other lens and they all have the same issue! There's no issue without the adapter with original lens. Has anyone experienced issues with this adapter?