[modeleng] Re: Milling Problem
- From: "John Buckley" <jbuckley@xxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 4 Aug 2006 04:08:38 +1000
Lee, It may be a stupid questions but is his milling table gib strips
adjusted up correctly?
What about backlash in the feedscrew? If there is 'free' movement when he
brings the cutter into contact then there is the potential for the table to
move and thus cause the cutter to do what it is doing
John
----- Original Message -----
From: "Lee Grant" <leegrant@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Thursday, August 03, 2006 8:01 PM
Subject: [modeleng] Milling Problem
> I have just joined another new forum on a commercial web site and came
> across this milling problem.
>
> >>>>>>>" Hi, I have nasty and expensive habit of breaking end mills. The
> last time, I cut a slot across a piece of 3/8" mild steel by making
> progressive passes increasing the depth each time by traversing the work
> piece toward me starting with the work on my side of the cutter. When I
was
> at the desired depth I needed to widen the slot so I moved the work piece
> toward me clear of the cutter and traversed the work piece to the left so
> that when I bought the work back toward me I would not be "climb milling".
> Well as soon as the cutter hit the work it bit very hard and climbed
around
> the outside of the work piece, pushed it out of the way and destroyed
> itself.
> What am I doing wrong?
> Arch"<<<<<<<
>
> I thought that he may have been using a 4 flute end mill and plunge
cutting
> and suggested he try a slot drill or drop the end mill to the full depth
and
> then feed it side ways.
> His reply
>
> >>>>>>>>>"Hi Lee, Thanks for your reply. Actually I am approaching the
work
> from the side taking a full width cut each time until the desired depth is
> reached. Then I move the work sideways and try to come back using the side
> of the end mill and that is when the tool grabs (even with shallow cuts)
and
> climbs around the work. The has happened to me twice now with the same
> disasterous result.
> Arch"<<<<<<<<
>
> Can anybody give me any better ideas. Or if you prefer the forum is at the
> new MiniTech web site http://www.minitech.com.au/
>
> Lee
>
>
>
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