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Home Model Engine Machinist > The Tools and Tips > Machine Modifications > AL320G and HXX GCS900-3D - Lathe DRO Setup

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Old 12-07-2017, 09:46 AM   #11
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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.




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Old 12-07-2017, 01:25 PM   #12
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While you have the cross slide of you may want to drill and fit 2 button oilers so you can oil the top of the dovetails and check the cross slide feed nut as mine was not flat where it makes contact with the cross slide and began to rock as the slide was wound in or out , this eventually wore the thread out .


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Old 12-08-2017, 07:11 PM   #13
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While you have the cross slide of you may want to drill and fit 2 button oilers so you can oil the top of the dovetails and check the cross slide feed nut as mine was not flat where it makes contact with the cross slide and began to rock as the slide was wound in or out , this eventually wore the thread out .
The nut looks ok and i have adjusted it to pretty much eliminate any perceptible backlash.

On the oilers, I’m probably being thick, do you mean oil ports that will drop into where the gibb and its opposite side “squeeze” the dovetail? As distinct to the existing ports that oil where the slide runs on?

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Old 12-08-2017, 09:45 PM   #14
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Yes so the gib and opposite side dovetail get some oil , i have just done this to my 320 along with a new cross slide nut as my one was the older style and not adjustable .
I' m currently rebuilding it and making modifications as i go but for now it is still in a million pieces getting the paint stripped back .
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Old 12-10-2017, 05:59 AM   #15
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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.


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Old 12-15-2017, 08:11 AM   #16
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A small update to show the finished X axis scale.

Slide all mounted, on the backing plate, aligned to within 0.01mm on its travel, custom aluiminium block fitted to the reader and mounted to the saddle with M5 bolts. I'm still on the fence about how best to put a stop in place for the tail stock. Maybe just drill/tap for and install an M8 cap screw into the ali block bolted to the saddle. That would allow an adjustable stop and will be pretty solid.




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Old 12-15-2017, 05:37 PM   #17
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I'm still on the fence about how best to put a stop in place for the tail stock. Maybe just drill/tap for and install an M8 cap screw into the ali block bolted to the saddle. That would allow an adjustable slot and will be pretty solid.
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M8 Are you going to drive that tail stock in with a sledge hammer - M5 Bro
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Old 12-15-2017, 07:07 PM   #18
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M8 Are you going to drive that tail stock in with a sledge hammer - M5 Bro
Was thinking more about the nice large surface area the M8 cap screw has on the head. Not because it needed strength of the M8.
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Old 12-17-2017, 06:05 AM   #19
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Default Beginning work on the Compound (Top Slide)

Started on the compound scale this weekend with most of the progress being made today.

Initial test fits of the scale to get an idea of where the best placement will be and where the reader will sit in relation to the compound.




Having figured out the placement I measured the backing plate for where I would need to make holes in the both it and into the compound. Here is the result post drilling etc with an initial fit with no standoffs.


Cover in place and starting to feel reasonably confident this is going to work out. Now remember I still need to make some standoffs as my lathe does not use tapered gibs.




The stand-offs being created. One is tapped M4 so the mounting/backing plate can be secured using the existing mounting holes in said plate. The other hole is a through hole to the tapped hole in compund.


The result with stand-offs mounted onto the back plate.




Trial fit on the compound. Everthing lined up perfectly.


These last two are the scale mounted on the compound with only the mounting block for the reader to be solved.




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Old 12-17-2017, 08:46 AM   #20
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For anyone who might be interested the scales I got are:
Z1-Axis: 600mm travel https://www.aliexpress.com/item/New-...311.0.0.7BzZOZ

Z2-Axis: 70mm travel Using the same slim slide as the X axis from the same supplier but cut to a custom length by asking said supplier.

X-Axis: 200mm travel https://www.aliexpress.com/item/Slim...311.0.0.7BzZOZ


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