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+--- Thread: RF-45 Downfeed Lock Knob (/thread-456.html)
RE: RF-45 Downfeed Lock Knob - henryarnold - 06-03-2012
(06-03-2012, 07:33 AM)stevec Wrote:(06-02-2012, 09:26 PM)Highpower Wrote: Henry,A 3" diameter knob has a circumference of almost 10" and those 7/8"
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.
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.
RE: RF-45 Downfeed Lock Knob - EdK - 06-03-2012
(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
RE: RF-45 Downfeed Lock Knob - Highpower - 06-03-2012
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.....
![[Image: P8040085.jpg]](http://img.photobucket.com/albums/v82/Highpwr/Shop%20Projects/P8040085.jpg)
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!"
RE: RF-45 Downfeed Lock Knob - henryarnold - 06-03-2012
(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:
[attachment=1761]
And the boring head:
[attachment=1762]
RE: RF-45 Downfeed Lock Knob - henryarnold - 06-03-2012
Better photo showing cutouts
[attachment=1764]
RE: RF-45 Downfeed Lock Knob - EdK - 06-03-2012
Henry,
That knob looks perfect to me. Good gripping surfaces.
Ed
RE: RF-45 Downfeed Lock Knob - stevec - 06-03-2012
(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).
RE: RF-45 Downfeed Lock Knob - henryarnold - 06-03-2012
(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.
RE: RF-45 Downfeed Lock Knob - Mayhem - 06-03-2012
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.
RE: RF-45 Downfeed Lock Knob - Highpower - 06-03-2012
(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!
