Plasma centre piercing

[4130metalworks]

This is the first time I have tried the drill function in sheetcam to mark location of holes. Just checking this is how good to expect
Front side isn't super great, backside is almost perfect
12mm thick mild steel

[acourtjester]

I use a dimple method for marking holes to be drill after, just a quick peck to center punch locations.

dimple 1.JPG (42.5 KiB) Viewed 633 times

dimple 1.JPG (42.5 KiB) Viewed 633 times

[adbuch]

This is the first time I have tried the drill function in sheetcam to mark location of holes. Just checking this is how good to expect
Front side isn't super great, backside is almost perfect
12mm thick mild steel

Those turned out great! I assume they are around 1/8" or so in diameter. TJ turned me on to using drill mills to open up holes to size. The drill mills are used on a milling machine or similar. I bought a set of them, but have not had a chance to try them out yet. They look something like this one. I bought mine on Ebay but are a different brand.

Here is a thread with more discussion about this.

viewtopic.php?p=233274&hilit=drill+mill#p233274

David

[4130metalworks]

Thank you for the reply david and acourtjester. I’ll give both those methods a try

I didn’t have much issue drilling the holes afterwards with a standard hss drill although on larger holes that needed more plasma time those mill style drill would be the ticket