Ordered these a while back. Of course I never marked their specs. Can anyone hazard a guess at their width and angle?

 

Eighth inch shank and 20* - 30* point angle.

 

But what is the width of the cutting surface (tip diameter)? I need that to calculate cutting width for isolation routing.

 

Don't you keep your order records? For me, it's my e-mail database. If I can remember what it's called, I can find the details of anything I've ordered in over a decade. (Yeah, the database is kinda big.) Short of that, I'd say get your micrometer out.

 

Don't you keep your order records? For me, it's my e-mail database. If I can remember what it's called, I can find the details of anything I've ordered in over a decade. (Yeah, the database is kinda big.) Short of that, I'd say get your micrometer out.

Ordered from ebay but it is a generic description now after all of this time. No details on exactly what was ordered.

I am measuring .32 mm with my cheapie micrometer and that is about what I have entered as a tool diameter for the last time I used pcb gcode a year ago.


Does that sound right?

 

I may misunderstand but isn't the thickness of the router blade (the z-axis perpendicular to the screen when viewing your drawing above) far more than that?

 

I need the tip diameter of my bit. Tip diameter is shown in drawing.

 

You need to pick up a digital vernier, they can be had cheap.
https://www.amazon.ca/Digital-Carbo...483677373&sr=8-5&keywords=digital+micrometers
Max.

 

But the hole cut by that tip will be at least as wide as the thickness of the blade, won't it? I think that's probably more than 0.32mm.

 

But the hole cut by that tip will be at least as wide as the thickness of the blade, won't it? I think that's probably more than 0.32mm.

No you don't mill that deep. There is a calculator out there (don't have it handy right now) that tells you the actual width based off the width of the tip and angle of the bland and depth being cut.

 

You need to pick up a digital vernier, they can be had cheap.
https://www.amazon.ca/Digital-Carbo...483677373&sr=8-5&keywords=digital+micrometers
Max.

Have one of those but trying to measure such a small size accurately is difficult. Plus it does not tell me the angle of the blade.

 

Have one of those but trying to measure such a small size accurately is difficult. Plus it does not tell me the angle of the blade.

I think I would just try it at different depths and see what results I like.

 

Have one of those but trying to measure such a small size accurately is difficult. Plus it does not tell me the angle of the blade.

And since you mentioned having a micrometer, that is more accurate anyway.

 

And since you mentioned having a micrometer, that is more accurate anyway.

a digital vernier, but I did not know they were called that.

 

I think I would just try it at different depths and see what results I like.

It is not the depth of the cut. It is the width I need to know. The isolation software needs to know how many passes it will need to make. Of course I can still experiment.

 

a digital vernier, but I did not know they were called that.

Just know a vernier , digital, dial or a true vernier is still easier to not get the correct feel with it when measuring. And just being "digital" doesn't make them any more accurate, just easier to read.

Even knowing the 'width' of the tip on those type cutters doesn't mean that's how wide they will cut. A test cut at depth of cut is a better and probably the only way to really know. Those "D" engraving cutters are not held to the same standards as an end mill. A little off center with the grind will make the path of cutting edge rotation eccentric giving a larger than expected cut.

 

Just know a vernier , digital, dial or a true vernier is still easier to not get the correct feel with it when measuring. And just being "digital" doesn't make them any more accurate, just easier to read.

Even knowing the 'width' of the tip on those type cutters doesn't mean that's how wide they will cut. A test cut at depth of cut is a better and probably the only way to really know. Those "D" engraving cutters are not held to the same standards as an end mill. A little off center with the grind will make the path of cutting edge rotation eccentric giving a larger than expected cut.

Yes I am aware.

I am sure you know that the width of the cut can also be estimated by using its tip width and its angle.

http://woodworkerb.com/home/pcb-isolation-routing/tool-width-calculator/

I am considering moving to end mills. Supposedly, you can go to 10-mil trace-and-space clearance with end mills and they make for a neater job.
.

 

I am considering moving to end mills. Supposedly, you can go to 10-mil trace-and-space clearance with end mills and they make for a neater job.
.

You need a spindle with acceptable run out when using these, I picked up a Japanese made engraver head off ebay cheap.
Max.

 

You need a spindle with acceptable run out when using these, I picked up a Japanese made engraver head off ebay cheap.
Max.

Can you point be to what you bought?

 

Can you point be to what you bought?

It was a one-off a while ago, I still have a photo of it somewhere, if I find it I will post.
It was not the self powered type, so I coupled a small H.S. DC motor to it.
Max.