RE: [CAD_CAM_EDM_DRO] Re: Very Confused!! Need help.

Normally tool makers only want to go 1 to 1 (diameter to depth) on an
end mills. I've gone deeper on a CNC machine, but not a hand drill. When
you take deep cut carbide works better it is stronger than high speed.
Spiral cutters cut free than a straight fluted cutter.
Contact the maker of the end mill and they will give you a catalog or
many of them have the info online to get the speeds & feeds you need.
They will also have the formulas you need.

Dale Beckel
Mansfield Screw Machine Products



-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Johan Van Wyk
Sent: Friday, January 05, 2007 1:29 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] Re: Very Confused!! Need help.

I'm using a bosch 800 watt hand drill fixed to the gantry, it has a
variable speed and torque controller, so what I usually do is to adjust
the speed till I get the best results on the plastic, so far I've been
too chicken to actually try and put it through any metal type material.
My favorite bit to use is a 3mm straight 3 flute HSS bit. At the price
of those it's a unnerving experience when one of them break, and I've
gone through 2 already.

One thing that I saw is that there is a bit of a shudder on the drill
when the chips actually start flying, I suppose that is one of the
drawbacks of using a gantry style setup, the Z-axis is "hanging" off the
rest of the machine, and I couldn't get it as rigid as I was hoping..

One of you asked whether I calculated the cutting speed, and I have to
confess, I'm really no machinist so no I haven't is there some specific
formula for that? So far I've just been slowly in increments trying to
ramp up the speed, I try to keep my cuts less that 5mm deep at a time,
am I being too aggressive in how much I cut?

Thanks so far anyways

________________________________

From: CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ] On Behalf Of lcdpublishing
Sent: Thursday, January 04, 2007 8:01 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
Subject: [CAD_CAM_EDM_DRO] Re: Very Confused!! Need help.

Johan,

Along with all the other questions, let us know what spindle you are
using? Is it a router, a dremel, etc.

Seeing as you are breaking tools I am guessing you are using a
dremel motor with tiny dremel bits?

Chris

--- In CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> , "Johan Van Wyk" <wykj@...>
wrote:

>
> I recently finished my first homebuilt router pouter project, and

was

> doing some trial runs for a while now, just figuring out the best
> software solution etc. etc. So basically I've been cutting air for

2

> months now just to suss things out..
>
>
>
> One thing I now realized that I made a mistake on is my ever

increasing

> need for speed, so at the moment I got a good mix between speed and
> torque.
>
>
>
> Now I started putting some wood and plastic under that cutter to

see the

> chips fly, and lo and behold all that speed was completely

unnecessary,

> I'm not able to cut anything at speeds more than approx. 5mm per

minute,

> what am I doing wrong??? I keep breaking bits if I go faster, or

the

> cuts become very dirty and especially plastics start chipping etc.

So

> why do I keep reading on these forums about xxxx ipm if all that

speed

> is wasted on everything except G00 rapids??
>
>
>
> Maybe one of the boffins on here have some idea of what I'm talking
> about, and maybe able to help me understand this...
>
>
>
> Any help will much appreciated.
>
>
>
> BTW. To all the lurkers out like me out there, it really isn't that
> complicated to make a machine so start already.....!!!! You'll be

amazed

> at the feeling you get inside the first time that machine starts

moving

> on it's own..
>
>
>
> Thanks
>
>
>
> Johann van Wyk
>
>
>
> [Non-text portions of this message have been removed]
>

[Non-text portions of this message have been removed]