On Monday, August 15, 2011 07:49:47 AM John Thornton did opine:
> That does sound pretty weak, perhaps more hole than should be done on a
> mini mill.
>
> John
>
> On 8/15/2011 6:40 AM, andy pugh wrote:
> > On 15 August 2011 12:28, John Thornton wrote:
> >> If you want perfectly round holes get
On 15 August 2011 12:45, John Thornton wrote:
> That does sound pretty weak, perhaps more hole than should be done on a
> mini mill.
To be fair, the rating plate says 30mm facing and 20mm end-milling, so
single-point boring 60mm in cast iron is probably pushing the envelope
too far. However, the
That does sound pretty weak, perhaps more hole than should be done on a
mini mill.
John
On 8/15/2011 6:40 AM, andy pugh wrote:
> On 15 August 2011 12:28, John Thornton wrote:
>> If you want perfectly round holes get a boring bar.
> In some cases a boring bar will work less well than
> backlash-
On 15 August 2011 12:28, John Thornton wrote:
> If you want perfectly round holes get a boring bar.
In some cases a boring bar will work less well than
backlash-compensated spiral milling.
And in the case of a Mini Mill (and this is a Mini Mill) the
head/column stiffness is very different in X a
If you want perfectly round holes get a boring bar.
John
On 8/14/2011 4:56 PM, Chris Reynolds wrote:
> I'm using my Harbor Freight X2 mini mill. I converted it to cnc not long ago.
> I don't cut a lot of circles with it but when I do I noticed they are not
> perfectly round. I'll check for bind
Im often working on round parts so a chuck is mounted on a rotary
http://www.youtube.com/watch?v=Jbp8SJ9RxqI
then I can mill it all at one basic setting so it will be concentric, round
and regular features where I want
Dave Caroline
On Mon, Aug 15, 2011 at 2:05 AM, Dave wrote:
> So you put the w
So you put the work piece on the rotary table and spin the table beneath
the boring bar or milling cutter?
Dave
On 8/14/2011 2:33 PM, Dave Caroline wrote:
> I cheat and use the rotary table :)
>
> Dave Caroline
>
> --
>
Rather than hole cutting to start with, maybe you could mount a pen
and make sure everything 'prints' square/round?
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On 14 August 2011 22:56, Chris Reynolds wrote:
> I'm using my Harbor Freight X2 mini mill.
If holes are smaller in X then I think you will find it is the column
twisting, though making the gibbs tighter might help. The problem with
that is that with mine the ways are tapered, so tight enough to n
I'm using my Harbor Freight X2 mini mill. I converted it to cnc not long ago. I
don't cut a lot of circles with it but when I do I noticed they are not
perfectly round. I'll check for binding on the different axis, but I've never
had a problem with them binding in the past, the gibs might need a
And a possible other case I cannot answer myself
trajectory planner setting and how close to the planned curve it
manages or you set
Dave Caroline
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That is not cheating, it is using your head. :-)
Dave
On Sun, 2011-08-14 at 19:33 +0100, Dave Caroline wrote:
> I cheat and use the rotary table :)
>
> Dave Caroline
>
> --
> FREE DOWNLOAD - uberSVN with Social Coding f
I cheat and use the rotary table :)
Dave Caroline
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On 14 August 2011 19:20, dave wrote:
> On sloppy machines like mine with backlash at 0.003 nominally round
> holes are produced by a boring head. That is, rough mill to a few thou
> then bore to make them and me happy.
My machine makes oval holes even with a boring head and with the axes locked.
What magnitude of un-roundness are you seeing. Mounting a dial indicator
and sweeping the radius and recording at least every 45 degrees would be
most helpful.
On sloppy machines like mine with backlash at 0.003 nominally round
holes are produced by a boring head. That is, rough mill to a few tho
Chris Reynolds wrote:
> In the past whenever I've machined holes they end up not perfectly round. I
> wondered if part of that could be because of the backlash compensation or
> some other setting that I have. I don't think my machine has that much play
> in it that it would cause circles to com
On 14 August 2011 05:18, Chris Reynolds wrote:
> In the past whenever I've machined holes they end up not perfectly round. I
> wondered if part of that could be because of the backlash compensation or
> some other setting that I have. I don't think my machine has that much play
> in it that it
I have never seen a perfectly round hole. I have seen many holes that are
within the design tolerance for roundness. Without some knowledge of the
imperfection it is impossible to determine the reason of the imperfection.
Please describe the imperfection.
On Sat, Aug 13, 2011 at 11:18 PM, Chris Re
And another source of error is loose gib strips and off center lead
screws, causes a rotation of the table
Dave Caroline
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ubject: [Emc-users] holes that aren't pefectly round
>
>In the past whenever I've machined holes they end up not perfectly round. I
>wondered if part of that could be because of the backlash compensation or some
>other setting that I have. I don't think my machine has t
Backlash needs measuring, get dti, move in one direction stop set 0 on
emc AND the dti
move forward and back to emc 0
move backward and back to emc 0
on both x and y
and if perfect check scale figures you entered
also any screw accuracy errors will also cause out of round, see docs
for screw compen
In the past whenever I've machined holes they end up not perfectly round. I
wondered if part of that could be because of the backlash compensation or some
other setting that I have. I don't think my machine has that much play in it
that it would cause circles to come out like that.
Chris
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