I usevcow magnets for test for 400 series stainless steel and picking steel items that drop hard to get places.?
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I have no idea where get cow magnets.?
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Dave?
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On Fri, Nov 8, 2024 at 10:39 AM, mike allen wrote:
??? Cow magnets are extremely strong too .
animal
On 5/25/24 10:41 AM, Chris Albertson wrote:
Yes, it should be clear that you can’t mount the DRO at three locations and have them slide accurately unless you drill the mounting points with 0.0001 level precision. ? The “roller” was to be EXACLY parallel in both directions the what is moving and that is impossibly hard to do. ? The solution is two-point mouting. ?Fix one end of the rule and the slider. ?Let the other end of the rule float.
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It’s not tension on the rule, it is that you can’t expect to mount the rule parallel to the motion. ??
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I think people try to hard to make the mounting strong. ?You can use 3D-printed plastic and magnets. ?Magnetic mounts if well-designed work well, Everyone use then on their dial indicators.
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Rare Earth magnets are now really inexpensive and you cn buy them on Amazon. ?These things are powerful enough to be dangerous if mishandled.
?
?
?
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I have the iGaging dros on my Clausing 8520.
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One thing I learned in installing them is that only one end needs to be fixed, the other end can float.
I installed a long DRO with both ends fixed and had erroneous?errors. I Googling the problem I learned that I could let one end float relieving the tension
that was causing the error.
?
Of course a "professional" installer freaks out when they hear this but they get paid to install them without the tension, fixed on both ends.
I have one that has was installed ten years ago with a floating end and still working fine.
?
Ralph
Mark,
I am in the process of using an iGaging DRO on one of my Unimats. I am also experiencing some issues with mounting the system in a neat fashion. ?
?
?
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??? Cow magnets are extremely strong too .
animal
On 5/25/24 10:41 AM, Chris Albertson
wrote:
toggle quoted message
Show quoted text
Yes, it should be clear that you can’t mount the DRO at three
locations and have them slide accurately unless you drill the
mounting points with 0.0001 level precision. ? The “roller” was to
be EXACLY parallel in both directions the what is moving and that
is impossibly hard to do. ? The solution is two-point mouting.
?Fix one end of the rule and the slider. ?Let the other end of the
rule float.
It’s not tension on the rule, it is that you can’t expect to
mount the rule parallel to the motion. ??
I think people try to hard to make the mounting strong.
?You can use 3D-printed plastic and magnets. ?Magnetic mounts
if well-designed work well, Everyone use then on their dial
indicators.
Rare Earth magnets are now really inexpensive and you cn
buy them on Amazon. ?These things are powerful enough to be
dangerous if mishandled.
I have the iGaging dros on my Clausing
8520.
One thing I learned in installing them is that
only one end needs to be fixed, the other end can
float.
I installed a long DRO with both ends fixed and
had erroneous?errors. I Googling the problem I
learned that I could let one end float relieving the
tension
that was causing the error.
Of course a "professional" installer freaks out
when they hear this but they get paid to install
them without the tension, fixed on both ends.
I have one that has was installed ten years ago
with a floating end and still working fine.
Ralph
Mark,
I am in the process of using an iGaging DRO on one
of my Unimats. I am also experiencing some issues
with mounting the system in a neat fashion. ?
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Re: Three Jaw Chuck / Spindle Bore Opening
I have done many modifications to my mini lathe. Regards, John Mattis (retired mechanical engineer) On Thu, Oct 31, 2024 at 7:42?AM atkinson.railroad via <atkinson.railroad= gmail.com@groups.io> wrote:
I figured there was a simple answer to this.
?
Thank you!
?
John
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Re: Three Jaw Chuck / Spindle Bore Opening
I figured there was a simple answer to this.
?
Thank you!
?
John
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Re: Three Jaw Chuck / Spindle Bore Opening
You can bore the small 3-inch 3-jaw chuck out to 0.760 inches very easily. A better option is to purchase the 4-inch 3-jaw chuck?from Little Machine Shop. Regards, John Mattis (retired mechanical engineer) On Thu, Oct 31, 2024 at 4:24?AM atkinson.railroad via <atkinson.railroad= gmail.com@groups.io> wrote:
Recently have started to use my little ole lathe. My machining background stems from “repair” as opposed to “fabricating” and so one of the first things I did was acquire a 4-jaw chuck.
After having the lathe for near 5 years now, I discovered the bore of the 3-jaw chuck is smaller than the lathe spindle opening.
I did not have a reason to notice this discrepancy before because I hardly ever used the 3-jaw chuck until lately for some repetitive work.
?
Is this something we just have to accept as an attribute of the machine, or is there a three jaw chuck available with a bore opening as large as the spindle opening?
?
John
?
?
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Three Jaw Chuck / Spindle Bore Opening
Recently have started to use my little ole lathe. My machining background stems from “repair” as opposed to “fabricating” and so one of the first things I did was acquire a 4-jaw chuck.
After having the lathe for near 5 years now, I discovered the bore of the 3-jaw chuck is smaller than the lathe spindle opening.
I did not have a reason to notice this discrepancy before because I hardly ever used the 3-jaw chuck until lately for some repetitive work.
?
Is this something we just have to accept as an attribute of the machine, or is there a three jaw chuck available with a bore opening as large as the spindle opening?
?
John
?
?
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Re: Troubleshooting Dead unit
LOL. Been there, done that! Glad it was simple! On Oct 29, 2024, at 7:46?PM, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
I want to thank everyone for their suggestions, which seemed particularly good.? I was able to print out the schematic, thanks.
?
I started trying to measure voltage on the control board.? Nothing.? ?I could not even see voltage on the AC line......? That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow.? I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in.? An embarrassingly simple solution.? ?I know perfectly well that when something is not working, I should first check power, AC or battery.
?
Thanks to all,
Richard
--?
Bruce Johnson
The less a man knows about how sausages and laws are made, the easier it is to steal his vote and give him botulism.
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Re: Troubleshooting Dead unit
As a retired I.T. Professional my goto is to usually ask that but sometimes it can come off as sarcastic or rude to ask the universal question (actually there are 2; is it plugged in and did you turn it off then on?) . I'm glad it was a simple fix.?
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Re: Troubleshooting Dead unit
I spent the best part of an hour pulling my “dead” laser cutter apart before realising I’d forgotten to turn the emergency switch back on. ? We all have brain fades occasionally.? At least it’s funny afterwards, ? Tony ? ?
toggle quoted message
Show quoted text
From: 7x12MiniLathe@groups.io <7x12MiniLathe@groups.io> On Behalf Of Arthur Coe via groups.io
Sent: Wednesday, 30 October 2024 4:02 PM
To: 7x12minilathe@groups.io
Subject: Re: [7x12MiniLathe] Troubleshooting Dead unit? That makes me feel better for my experience of thinking my lathe was dead - only to realize I had activated the emergency shut-off switch. I want to thank everyone for their suggestions, which seemed particularly good.? I was able to print out the schematic, thanks. I started trying to measure voltage on the control board.? Nothing.? ?I could not even see voltage on the AC line......? That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow.? I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in.? An embarrassingly simple solution.? ?I know perfectly well that when something is not working, I should first check power, AC or battery.
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Re: Troubleshooting Dead unit
That makes me feel better for my experience of thinking my lathe was dead - only to realize I had activated the emergency shut-off switch.
On Tuesday, October 29, 2024 at 07:46:58 PM PDT, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
I want to thank everyone for their suggestions, which seemed particularly good.? I was able to print out the schematic, thanks.
?
I started trying to measure voltage on the control board.? Nothing.? ?I could not even see voltage on the AC line......? That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow.? I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in.? An embarrassingly simple solution.? ?I know perfectly well that when something is not working, I should first check power, AC or battery.
?
Thanks to all,
Richard
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Re: Troubleshooting Dead unit
I wouldn't be too embarrassed.? That sort of thing happens to most everybody.? And if not, it is because they never DO anything.? And even though a simple fix, it helped to go through some steps and then you got there.
I was once testing a very high impedance op amp amplifier circuit I was designing and was getting all sort of noise.? I checked all sorts of things.? Checked that the oscilloscope was isolated.? Everything.? Was at it a couple of hours.? Then I realized I had not turned on the power supply to the board.? With no power, my circuit was basically just being an antenna.
The GOOD news is that there was no electronic issue with your lathe - this time.? But with a schematic now, you will be better prepared if some issue does arise.
Charles E. "Chuck" Kinzer
On Tuesday, October 29, 2024 at 07:46:58 PM PDT, Richard Ferguson via groups.io <richardferguson3.14@...> wrote:
I want to thank everyone for their suggestions, which seemed particularly good.? I was able to print out the schematic, thanks.
?
I started trying to measure voltage on the control board.? Nothing.? ?I could not even see voltage on the AC line......? That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow.? I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in.? An embarrassingly simple solution.? ?I know perfectly well that when something is not working, I should first check power, AC or battery.
?
Thanks to all,
Richard
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Re: Troubleshooting Dead unit
I want to thank everyone for their suggestions, which seemed particularly good.? I was able to print out the schematic, thanks.
?
I started trying to measure voltage on the control board.? Nothing.? ?I could not even see voltage on the AC line......? That is when I checked, and found that the extension cord that the lathe was plugged into had become unplugged somehow.? I had been using that extension cord to power a bandsaw earlier in the day, so I assumed that it was still plugged in.? An embarrassingly simple solution.? ?I know perfectly well that when something is not working, I should first check power, AC or battery.
?
Thanks to all,
Richard
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Re: Troubleshooting Dead unit
LMS also has a good troubleshooting guide:
?
?< >
?
Having? said that, a close visual inspection is always a good first step. Look for things like disconnected connectors, foreign objects, broken and/or pinched wires.
?
Roy
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Re: Troubleshooting Dead unit
Had a similar problem with my 7x11 and track it down to the connection to the carbon brush. Good luck
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Re: Troubleshooting Dead unit
How far did you check power?? As in, is the control board even getting power (past the fuse, mag switch, e-switch)?? A VOM is certainly your friend here and even beyond that a scope isn't necessary.? Also, do you switch directions with the lathe powered up?? ?
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Re: Troubleshooting Dead unit
And this site has more detailed info on the (probable) ?controller board, but honestly, unless you’re adept at repairing complex electronics, if it’s the board, getting a new one is the easiest bet.
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davesmith1800
John Mattis