Hole Depth (drill Depth)

[ray]

Tom, welcome to the forum. What steam engine are you building? For me, it depends on what the hole is for.

 

[tomw]

Ray,
Thank you for the welcome. I am building the PM Research steam engine #3

The drawings are great, but they just call out "Drill #38 3/4 depth" for example. Thus my question about generally accepted standards for hole depth on a drilled holed. My wife belongs to a band called the Minor Mishap Marching Band. Because of several small errors so for, I am naming my first project in their honor. I am also painting it the band colors (yellow and black).

 

[ray]

I'll be dog goned. I built that engine last year. The 3BI. It is a pretty nice engine. These were before I finished it.

 

[Dawner]

Thank you all for your responses. The drawing I am working off of (a steam engine kit) does not specify shoulder or full depth (A or B), so I thought there might be a convention. It seems like maybe there isn't. I guess I will go to B, and if it is not deep enough go to A.

drill baby drill

 

[smoa]

I always interrupt it as A, unless otherwise specified.

 

[EmilioG]

I have a similar situation with counter bored holes, so I will use an end mill for the counter bore. I use end mills for drill or finishing a hole to size when I want a
flat bottom. You can also grind a flat bottom drill. I'm still trying to learn to do this. Anything else, I always calculate the entire drill to the point. i.e. blind holes
Of course, there is also the boring head.