RF-45 Downfeed Lock Knob

[henryarnold]

(06-03-2012, 07:33 AM)stevec Wrote:

(06-02-2012, 09:26 PM)Highpower Wrote: Henry,

7/8" radius? On a 3" diameter knob?

Maybe just my eyes playing tricks on me, but they don't look to be that big to me.

A 3" diameter knob has a circumference of almost 10" and those 7/8"
radius sectors (not full diameter) are probably around 3/4" across so I'd say, Ya your eyes must be playing tricks on you.
(or mine are)
Or maybe Henry meant 7/8" Diameter?
Oh, never mind

The knob has a circumference of about 9.4" ( 2 x 1.5" x 3.14). If you divide this by 12 (6 for peaks, 6 for valleys) you get 0.78". Although the boring bar radius is large, it only cuts 0.165" into the rim at 6 locations. This operation uses an interrupted cut so you must take it slow and use a nice sharp bit. I used a carbide boring bar which I had touched up with a diamond wheel.

If you have never used a boring head, I suggest you get one. They are very useful for many operations. The Chinese spin-offs are not very expensive.

[EdK]

(06-03-2012, 10:03 AM)henryarnold Wrote: If you have never used a boring bar, I suggest you get one. They are very useful for many operations. The Chinese spin-offs are not very expensive.

Henry,

Might you have meant a "boring head"?

Ed

[Highpower]

I've done the same thing to make quill locking pins for my mill. The cutouts almost appear to be straight cut rather than an arc. But I was cutting a larger radius.....



Math isn't my strong point so don't confuse me with facts Henry.

I just thought your cutouts would have had a wider arc than they do at that size radius. Which just goes to prove - "Be cool, stay in school!"

[henryarnold]

(06-03-2012, 10:11 AM)EdAK Wrote:

(06-03-2012, 10:03 AM)henryarnold Wrote: If you have never used a boring bar, I suggest you get one. They are very useful for many operations. The Chinese spin-offs are not very expensive.

Henry,

Might you have meant a "boring head"?

Ed

Yes, I fixed the post. The bits I used look like this:
   

And the boring head:

  Image2.jpg (Size: 12.17 KB / Downloads: 120)

[henryarnold]

Better photo showing cutouts
   

[EdK]

Henry,

That knob looks perfect to me. Good gripping surfaces.

Ed

[stevec]

(06-03-2012, 10:11 AM)EdAK Wrote:

(06-03-2012, 10:03 AM)henryarnold Wrote: If you have never used a boring bar, I suggest you get one. They are very useful for many operations. The Chinese spin-offs are not very expensive.

Henry,

Might you have meant a "boring head"?

Ed

Wait, I went back and re read "boring head" so I thought WTF?
Then I read further and realized Henry edited his post.
That shouldn't be allowed, it makes the guy who catches the error look like an idiot (sorry Ed).

[henryarnold]

(06-03-2012, 07:50 PM)stevec Wrote:

(06-03-2012, 10:11 AM)EdAK Wrote:

(06-03-2012, 10:03 AM)henryarnold Wrote: If you have never used a boring bar, I suggest you get one. They are very useful for many operations. The Chinese spin-offs are not very expensive.

Henry,

Might you have meant a "boring head"?

Ed

Wait, I went back and re read "boring head" so I thought WTF?
Then I read further and realized Henry edited his post.
That shouldn't be allowed, it makes the guy who catches the error look like an idiot (sorry Ed).

I aknowledged in my reply to Ed which I quoted that I fixed the post.

[Mayhem]

Editing should be allowed.

What I normally see on other sites is that if you edit a post before anyone has posted a reply, you can edit and nothing appears in the post to indicate it was edited. However, if you edit after a reply has been posted, the software places a footer that indicates the post has been edited, the person editing the post and a date/time stamp.

Some have a field when you edit where you can enter a reason for editing. A lot of people will place a note themselves when editing a post to let others know they edited it.

[Highpower]

(06-03-2012, 01:39 PM)EdAK Wrote: Henry,

That knob looks perfect to me. Good gripping surfaces.

Ed

Indeed. You can't argue with success!