Now while we say the blue plastic piece needs to be snug, don't make it too tight. The clearances are great enough here that you really do not need to 'mic it out'. Mount the trolley with the 'blue plastic piece' snug and all will be fine.
If you look at the above left photo you can clearly see the blue plastic piece is not even close to snug, it's simply laying there and would easily slide out if the scale were tilted to the side.
The point here is that there is plenty of room built into the scale for movement and to not get too wrapped up with this.
The only real catch here is to make sure the scale body is parallel to the machines movement, and make sure to mount the trolley so that it doesn't run into the end of the scale. Note also that most trolleys are a bit wider than the scale on one side, meaning that if you were to mount the scale against a perfectly flat surface, the trolley would be pushed out of alignment. Note in the following picture how the trolley is wider on the left side of the scale than it is the right.
If the scale were forcefully mounted against a flat surface on the left, the trolley would be forced out of alignment or pushed well to the right. Forcefully pushing the trolley out of position will decrease its' life expectancy greatly!
The short answer is no, you do not. But let's take a look at some exa mples to illustrate the point. The first series of pictures illustrates a 'traditional' installation on a milling machines' X axis where the scale has been mounted relative to the center of the table. The scale light blue has been attached to the table white. The trolley dark blue has been fastened to the base of the machine grey. Remember, we're presenting a typical installation first, followed by an example where the scale has been offset.
In this example, the scale body has been mounted well offset to the left of the table. Note how the trolley is 'centered' relative to the scale with the table in the middle, or neutral, position. In this diagram, the table has been moved to the extreme left. Note the trolley is nearing the right end of the scale. Now the table has been moved to the extreme right most position.
Again, note how the trolley is nearing, but not over, the left end of the scale. Now we realize no-one is going to mount a scale quite to the extremes of our previous example. But what we're trying to illustrate is this: First, you do not need to take elaborate steps trying to ensure a scale is perfectly 'centered', because it really doesn't matter. What really does matter is this - wherever you do end up mounting your scale centered or not , make sure the trolley is centered to the scales travel , and doesn't run off the end.
As easy as that! For some reason it is extremely common to try and align the mill brackets with the two large hexagonal openings on the side of the trolley.
The brackets are designed, however, to align with the four tapped holes on the underside of the trolley, not the two hexagonal shaped holes on the side. Of course, if it makes better sense to secure the trolley via the side holes, then go ahead and do it. Modifications are encouraged! Take a look at the following pictures:. While your particular mill may look altogether different, the basic concepts remain the same.
The first step is to determine which scale to mount first, and where to mount it. Today, we've decided to mount the Y scale first as the X scale will pass over the top of the Y scale. Looking at the right side of our machine, we see that the gib adjusting screws and table lock mechanism would present a challenge to mounting a scale on the right side:.
In contrast, the left side of the mill is relatively unobstructed, making it ideal for mounting the scale:.
But while the area is relatively unobstructed, the side is not machined square:. To compensate for the sloped surface, we'll install a backer bar.
On either end of the bar, top and bottom, are grub screws. These screw in or out, as needed, to level the bar:. Mark and drill the mounting holes for the backer bar:. Attach the backer bar using the supplied bolts:. Insert the grub screws on the backer bar:. With a dial indicator, ensure the backer bar is square and perpendicular to the machine slides:. Adjust the grub screws as needed until the backer bar is square and perpendicular to the machine slides.
The backer bar is now installed; level and parallel with the movement of the table:. Next, fasten the scale to the backer bar:. The scale is now installed! Next, we'll ensure our scale is parallel with our work surface. First, make sure the mill table is brought all the way to the rear. Install a dial indicator so that the indicator tip rests against the top of the scale:. Now move the table to the front of the machine:. If there is any movement of the dial indicator, loosen and adjust the scale end bolt as needed.
Repeat until the scale is perfectly aligned. Next, we need to mark the scales in a way that would visually warn us if the readhead is nearing the extreme end of the scale. If you have not done this already, here's how to do it:. Next, move the trolley to the end of the scale:. Mark the end of the scale above the mark on the trolley:. Note the marks now 'split':. With the trolley touching the opposite end of the scale, make another mark on the scale body opposite the mark on the trolley.
After properly mounting your scales, the green mark should always stay between the red marks at all times:. Now place the trolley bracket against the saddle where you intend to mount it:.
Drill the mounting holes for the trolley bracket:. Now fasten the bracket against the saddle:. The first trolley bracket is now installed! Next, place the second trolley bracket in place:. Loosely fasten the two bracket bolts:. Insert the trolley bolts through the bracket, into the trolley carriage:.
Tighten the trolley bolts. Make sure the trolley is not twisted as the bolts are tightened. Adjust the bracket as needed:. Now tighten the bracket bolts. Again, make sure the trolley is not twisted as the bolts are tightened. All that remains now is to verify the scale runs true with the proper spacing:. Run the table to the back of the machine:. As you move the table to the rear, make sure to check the spacing of the blue plastic piece.
It should be snug, but not overly tight, not overly loose. Optimally, it should look like this:. At no point should the blue plastic piece bind or become loose. A misaligned scale will look like this:. Note the gap between the blue plastic piece and the scale body. It is imperative to keep the blue plastic piece snug along the full travel of the scale. Please refer to the Getting Familiar with the Scales - Parts and Pieces section for more information regarding this issue.
If the blue plastic piece indicates the scale is out of alignment, loosen the scale end bolt and adjust the scale as needed:. Next, run the trolley to the other end of the scale.
Again, check the blue plastic piece alignment both during and after the trolley is moved. Loosen and adjust the scale end height as needed:. Congratulations, the scale is installed - now don't forget to remove the blue plastic piece! Scale "Read Direction". It makes no difference which way the scale initially reads.
Scale 'read direction' can be easily changed in the parameters menu after installation. In most cases, mount the scale with the cable exiting to the rear of the machine, away from the cutter. Please keep in mind every installation is unique, so there is no one "correct way" to mount scales. Referencing the Customer installation photos provided above may help immensely by seeing how our other Customers chose to mount their scales.
For general reference, we provide the following diagram. Remember, scale read direction is, in the end, a matter of personal choice:. To install a readout on a lathe the following tips can be used. To mount the cross slide scale, select a flat surface that is suitable and clear of the traveling parts of the lathe. The scale should be mounted insuring that that it is parallel and square to the slide.
When mounting the reader head, ensure it travels inline and square to the scale to avoid any damage to the scale. Testing for parallel can be done by either a dial indicator or a precision level. The longitudinal scale should be mounted on the back of the Lathe Fig 1 with the open side of the scale facing down and must be parallel to the bed. The reader head is mounted to the saddle Fig. Some modification may be required for some lathes. Covers should be mounted over the slides as per Fig.
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The information contained in this site was valid at the time of posting. Harris County assumes no liability for damages incurred directly or indirectly as a result of errors, omissions or discrepancies. Likes: 5 Post 3 Post 1 Post 1. Results 1 to 18 of Thread: Looking for cheap one axis DRO with diameter mode. Thread Tools Show Printable Version.
Looking for cheap one axis DRO with diameter mode Good morning. I have a very nice 9"SB that I am going to give to my grandson for Christmas. He is getting interested in machining and I think this would be a good start for him. I am looking for a very inexpensive one axis DRO with diameter reading capabilities.
Two axis would be fine but I only need the Y axis really. Thanks very much. Please teach him to use the dials and then get the DRO. I taught him how to use the dials on my Monarch. I just want to spiff it up a bit without spending a ton of money. Murf liked this post. I bought this one for my SB Heavy 10 almost 4 years ago. It's been great. I put a 4" one on my tailstock for drilling depths not the diameter mode version. I do not miss counting turns. Thanks for the link Cosmos. Looks like it might be out of my budget however.
I am going to keep looking. I thought mine was like , I guess the dual display ones aren't so cheap.
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