Author Topic: AL320G and HXX GCS900-3D - Lathe DRO Setup  (Read 463 times)

Offline Joco

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AL320G and HXX GCS900-3D - Lathe DRO Setup
« on: November 24, 2017, 09:37:39 AM »
This series of posts will show setting up a Hafco AL320G with a 3 axis DRO.  The linear scales are Dalco low profile scales and an HXX GCS900-3D display unit.

The linear glass scales just "do the business" where as the challenge is in the display unit.  The GCS900-3D is not an expensive unit and from what I have seen it seems to be a reasonable option for the hobby user.  My unit cost NZD135 delivered to my door.

Hopefully these videos will give some ideas and save anyone using these units some time.



EDIT: I have been in some conversation with HXX and they have told me to use DISP 7 not DISP 8.


Next up will be some installation notes and pics.

Cheers,
James.
« Last Edit: December 01, 2017, 08:39:17 AM by Joco »
James
Wellington - NZ

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #1 on: November 24, 2017, 08:31:07 PM »
One of the insights from my investigations so far is that if you want to use the Taper Measurement function you need to consider the following in your setup.

While a little mind bending (for me at least) the lathe's long axis (that which the saddle travels on) is considered Z or more correctly Z1 and the cross slide is X. Cool.  :D

The Top Slide (Compound) is normally considered Z2.  3 axis lathe DROs usually have a feature to combine the measurements of Z1 and Z2 into a single Z measurement.  Clearly the assumes you have the Top Slide facing in the same direction of travel as the Saddle.

SO, how does that relate to a multi function DRO?  The DRO has X, Y and Z axis.   X is mapped to the Cross Slide.  And on first blush you would map
Z to the Saddle (Lathe Z1) and
Y to the Top Slide (Lathe Z2).

HOWEVER the Taper measurement function takes is measurements off X and Y. This means you will have very limited travel along lathe Z2 for your taper measurement. Not necessarily the end of the world but something to consider when thinking about how you map your DRO axis to the Lathe's logical axis.

Cheers,
James.
James
Wellington - NZ

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #2 on: December 01, 2017, 10:17:13 AM »
Making progress on the Z1 axis.

Template to mark out the interference area for the lathes back shield.


I needed to make a quick tool to act as a drilling and tapping guide.  However got a little carried away and instead of just doing it for the M5 I needed I ended up making this little guide for M2.5, 3, 4, 5, 6 and 8.


The drilling tapping begins



I needed to make some spacers to hold the scale ~3mm off the lathe casting.  So some 3mm Ali flat bar to rescue


Scale mounted and DTI setup to test for alignment.   I finally managed to get the scale aligned in the vertical and horizontal to within 0.05mm over its length of slightly over 700mm.


Cheers.
James
Wellington - NZ

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #3 on: December 03, 2017, 07:18:43 AM »
Finalising the Z1 axis.

I needed to create a wide bracket with slotted holes to link the saddle to the aliuminium angle that bolted to the scale reader.   I wanted something 5-6mm thick but only had 3mm Ali sheet.  So having an ACDC welder I cut two sheets and plug welded ito all togther.  Then surfaced things a bit.  In hindsight I should have just left things alone. But in a burst of enthusiasim I was trying to make things better, instead I just created work for myself.


The plate in place linking saddle to scale reader.


You can see the linkage and how the nuts stick out.  This created an interference problem with the protetctive guard. A cunning suggestions from a friend (Bruce) had me creating a countersink for the nuts.


Here is said countersink.  This means no need to get a spanner to tighten the nuts.


And the finished install of Z1. Pretty happy with it so far.




Cheers,
James.
James
Wellington - NZ

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #4 on: December 03, 2017, 07:48:53 AM »
Starting the X axis and trying to figure out how best to mount it.

Showing the mounting back plate that came with the scales.  Its temporarily secured here.


A couple of views of the mounting position.




Here is where I think I will place the mounting holes.  They can go into lots of "meat" in the cross slide.


Cheers,
J.
James
Wellington - NZ

Offline Kim

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #5 on: December 03, 2017, 03:12:21 PM »
Joco, you're doing a nice job of attaching your DRO.  :ThumbsUp:
It always takes more work than you think, and there's always several fixes you have to get yourself out of, and you're doing an excellent job!

You'll love having the DROs when you get it completed!
Kim

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #6 on: December 06, 2017, 09:40:38 AM »
This is the mounting plate that is also part of the cover assembly that came with the scales.   It's mounted so that with the cover in place said cover will be just slightly under the top of the slide casting.

From this photo it should be visible that there is still good access to the gib adjustment screws.

Cheers,
J

James
Wellington - NZ

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #7 on: December 07, 2017, 09:45:22 AM »
Working on the cross slide tonight and got the 3 holes drilled 6mm deep and tapped M4.


Test fits with the mounting bracket and cover before moving on to next stage which is drilling the required holes in the mounting bracket.


James
Wellington - NZ

Offline Joco

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Re: AL320G and HXX GCS900-3D - Lathe DRO Setup
« Reply #8 on: December 10, 2017, 06:00:42 AM »
Some more progress shots from the last week and this weekend.

Cross slide post drilling with the mounting plate drilled and mounted.


The scale in place.


Testing with the cover on.  Nicely just below the surface of where the topslide will mount.


Been working on a bracket for the scale reader to be mounted to.  Here is the result test mounted on the top-slide scale.




Finally a test mount on the real deal.  since I have all four holes on the reader drilled into the bracker I can use two on the left side and reach up through the casting to tighten them once I have the head aligned with the mounted bracket.  Then carefully take off the slide to allow the last screws to be put in place and remount it all.  Should work and allow for repeatable positioning within acceptable tolerances.


Cheers,
J.
James
Wellington - NZ