zeeprogrammer
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Soon, if all goes well, I'll be starting another project. I'm doing a little research to see what is involved. Page 1...a counterbore. I haven't got one.
This has raised a number of questions and two goals...
Goal 1 is what/where to purchase such an item (drawing calls for 0.24" or ~15/64"). What I've seen so far is 'relatively' expensive. Please note the word 'purchase'...I'm not ready to make my own tools. On the other hand, I would certainly entertain alternatives. For example, my inexperienced mind would simply take a 15/64 drill bit and drill to the required depth. While I understand the shoulder is not optimal to hold a screw...it should be sufficient for this model. Another alternative might be that the diameter of the counterbore really doesn't matter. So why not take a 0.25 end mill and plunge to the desired depth? (This assumes you drill first then end mill without moving the table. Otherwise accuracy is 'iffy'.)
Goal 2 is to get a better understanding of 'counterboring'. Why, how, where, when, tools available, etc. So my hope is that this post might generate some interesting responses.
I did a little search on this fine forum and came across an interesting post by Bernd. Here it is.
http://www.homemodelenginemachinist.com/index.php?topic=1295.msg9327#msg9327
I put this link here so that others may find it.
Why else does one counterbore? So far I understand that counterboring allows you to put in a screw that can't stick out of the material it's in, yet provides sufficient shoulder to hold it.
I see that there are 'solid pilot' and 'interchangeable pilot'. It seems that an interchangeable pilot allows you to mix the counterbore diameter with different diameters of the hole through which whatever goes in. That is, more flexibility when dealing with the various screws/bolts etc. that have different diameter heads but the same thread diameter.
Not knowing much about this tool/procedure...I'm struggling to even know what questions to ask. This will be remedied as I learn more.
Thanks.
This has raised a number of questions and two goals...
Goal 1 is what/where to purchase such an item (drawing calls for 0.24" or ~15/64"). What I've seen so far is 'relatively' expensive. Please note the word 'purchase'...I'm not ready to make my own tools. On the other hand, I would certainly entertain alternatives. For example, my inexperienced mind would simply take a 15/64 drill bit and drill to the required depth. While I understand the shoulder is not optimal to hold a screw...it should be sufficient for this model. Another alternative might be that the diameter of the counterbore really doesn't matter. So why not take a 0.25 end mill and plunge to the desired depth? (This assumes you drill first then end mill without moving the table. Otherwise accuracy is 'iffy'.)
Goal 2 is to get a better understanding of 'counterboring'. Why, how, where, when, tools available, etc. So my hope is that this post might generate some interesting responses.
I did a little search on this fine forum and came across an interesting post by Bernd. Here it is.
http://www.homemodelenginemachinist.com/index.php?topic=1295.msg9327#msg9327
I put this link here so that others may find it.
Why else does one counterbore? So far I understand that counterboring allows you to put in a screw that can't stick out of the material it's in, yet provides sufficient shoulder to hold it.
I see that there are 'solid pilot' and 'interchangeable pilot'. It seems that an interchangeable pilot allows you to mix the counterbore diameter with different diameters of the hole through which whatever goes in. That is, more flexibility when dealing with the various screws/bolts etc. that have different diameter heads but the same thread diameter.
Not knowing much about this tool/procedure...I'm struggling to even know what questions to ask. This will be remedied as I learn more.
Thanks.