My numbers are similar (not exactly the same):
Major Dia: 0.3678
Minor Dia: 0.3239
Thread Depth: 0.2555
I am measuring with thread wires (0.029 dia) and am trying to get a pitch dia
of between 0.3468 and .3430 (class 2A or better).
-Tom
> On Jun 5, 2017, at 5:30 AM, andy pugh wrote:
>
> On
On Monday 05 June 2017 05:30:10 andy pugh wrote:
> On 5 June 2017 at 02:22, wrote:
> > Currently I do that by cutting a diameter with the threading tool.
> > I measure that with a micrometer and I enter the DRO value in the
> > tool touch off for that tool (I have a routine that leaves the tool
On 5 June 2017 at 02:22, wrote:
> Currently I do that by cutting a diameter with the threading tool. I
> measure that with a micrometer and I enter the DRO value in the tool touch
> off for that tool (I have a routine that leaves the tool at the diameter
> after cutting so this works). But I am
On 06/04/2017 09:13 PM, tom-...@bgp.nu wrote:
This is a G76 canned cycle and I usually enter 1 (sometimes 2) spring passes.
The spring pass(es) take no material so this isn’t a deflection problem.
My theoretical thread depth was 0.0255. I ended up needing to set it to
0.0280, but once set i
On 06/04/2017 08:56 PM, Jon Elson wrote:
On 06/04/2017 08:22 PM, tom-...@bgp.nu wrote:
I have to increase the depth a couple thou and re-cut the thread to
cut it deep enough.
Due to machine spring as well as workpiece deflection, a second pass
without even changing the X depth will take off
On Sunday 04 June 2017 21:56:46 Jon Elson wrote:
> On 06/04/2017 08:22 PM, tom-...@bgp.nu wrote:
> > I have to increase the depth a couple thou and re-cut the thread
> > to cut it deep enough.
>
> Due to machine spring as well as workpiece deflection, a second pass
> without even changing the X
This is a G76 canned cycle and I usually enter 1 (sometimes 2) spring passes.
The spring pass(es) take no material so this isn’t a deflection problem.
My theoretical thread depth was 0.0255. I ended up needing to set it to
0.0280, but once set it cuts correctly and repeatably.
I thought i
On 06/04/2017 08:22 PM, tom-...@bgp.nu wrote:
I have to increase the depth a couple thou and re-cut the thread to cut it
deep enough.
Due to machine spring as well as workpiece deflection, a second pass
without even changing the X depth will take off some material. So, if
you turn it down,
Well, I cut a bunch of screws today, which was executing a repetitive series of
gcode routines and I did not have this problem at all. I am now thinking it is
caused by something we are doing outside of the G76. We were touching tools
off and I am wondering if we did something that caused the
On Saturday 03 June 2017 10:08:47 tom-...@bgp.nu wrote:
> > On Jun 3, 2017, at 7:16 AM, Gene Heskett
> > wrote:
> >
> >
> > What then is the effect of g7/g8 on g76?
>
> Gene,
>
> According to the G76 man page:
>
> "Note:
> When G7 Lathe Diameter Mode is in force the values for I, J and K are
> di
> On Jun 3, 2017, at 7:16 AM, Gene Heskett wrote:
>
>
> What then is the effect of g7/g8 on g76?
Gene,
According to the G76 man page:
"Note:
When G7 Lathe Diameter Mode is in force the values for I, J and K are diameter
measurements. When G8 Lathe Radius Mode is in force the values for I, J
> On Jun 3, 2017, at 5:17 AM, andy pugh wrote:
>
> On 3 June 2017 at 01:11, wrote:
>> However, what we were seeing (and have seen multiple times now but cannot
>> yet re-create at will) is that even though our routine is commanding say, a
>> diameter of .324, the DRO in Axis is showing the c
On Saturday 03 June 2017 05:17:43 andy pugh wrote:
> On 3 June 2017 at 01:11, wrote:
> > However, what we were seeing (and have seen multiple times now but
> > cannot yet re-create at will) is that even though our routine is
> > commanding say, a diameter of .324, the DRO in Axis is showing the
On 3 June 2017 at 01:11, wrote:
> However, what we were seeing (and have seen multiple times now but cannot yet
> re-create at will) is that even though our routine is commanding say, a
> diameter of .324, the DRO in Axis is showing the cutter down below that.
> Meaning there is a disconnect
To touch the tool off I am physically cutting an OD, measuring that diameter
and touching off the tool using that mic’d measurement, so the “actual tip” as
you say. So, yes, we are cutting a tiny bit deeper.
However, what we were seeing (and have seen multiple times now but cannot yet
re-creat
How are you touching off (or otherwise determining the X tool offset for the
insert)?
For example, if you calculate the offset assuming a sharp-V geometry (the
simplest case), but touch off with the actual tip of the insert (not sharp),
the insert will be in deeper than LCNC thinks it is when y
Ok, thanks for the responses. I found some thread gauge wires and with them
have determined that we are cutting too deep. This would cause the pointy
peaks and root, so the next question is why are we cutting too deep…? We
believe we are entering the correct value for K (thread depth) but I w
On 06/02/2017 10:36 AM, tom-...@bgp.nu wrote:
There is a custom adjusting screw that I buy commercially and when I get them
the threads have a text-book geometry to them. That is, they have a small flat
top on the major diameter and small flat bottom at the minor diameter or root.
They are ma
Friday, June 02, 2017 12:39 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Question on thread geometry
>
> If this is a 3/8 x 24 then I assume it is a UNF thread.
> As I understand it, UNF (and UNC) threads are part of the UTC system, but
the
> specifica
If this is a 3/8 x 24 then I assume it is a UNF thread.
As I understand it, UNF (and UNC) threads are part of the UTC system, but the
specification for UNF and UNC threads is that UN threads typically have a flat
root, with the option of a rounded root. The rounded root simply gives more
clearan
As that one has a range then you turn to final diameter ans dont go
too deep with the insert, that leaves a flat on top.
Measure on the job with thread wires etc to check depth.
Dave Caroline
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