MicroMark 7x16 Fault Notice
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I have owned my MicroMark 7x16 MiniLathe for many years. I have been unable to start the lathe which is unusual as I have not had it happen before. I am receiving a ¡°fault notice¡± (yellow lamp is on). Could it be a blown fuse? There is a fuse socket present. How can I check the fuse? I don¡¯t have spares as I have never changed a fuse in the lathe for close to 20 years at least.
What fuse should I buy if I need one? Any help is appreciated. Dick |
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According to the manual on their site, the fuse is a?F10AL250V, which I assume is 10amp.? There weren't any instructions about removal, so I assume it's a twist-off cap that holds a glass fuse.? Should be able to see if the filament is discontiguous if it's burned out.? Manual also says it comes with a spare fuse, so if you still have the original bits lying around, you may still have the spare.
I'm going by the following pdf, although I don't know much about MicroMark - just found with a google search.
On Friday, December 29th, 2023 at 5:44 PM, OldToolmaker via groups.io <old_toolmaker@...> wrote: I have owned my MicroMark 7x16 MiniLathe for many years. I have been unable to start the lathe which is unusual as I have not had it happen before. I am receiving a ¡°fault notice¡± (yellow lamp is on). Could it be a blown fuse? There is a fuse socket present. How can I check the fuse? I don¡¯t have spares as I have never changed a fuse in the lathe for close to 20 years at least. |
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This was also in that manual: ATTENTION: The power supply system of the 120v AC machine has an automatic overload protective device. If the machine is overloaded, the
motor will automatically shut down, and the yellow lamp will light and the readout will display ¡°ERR¡± (if equipped). IMPORTANT! First, rotate the RPM to OFF (counter clockwise). The display should read four zeros (0000) and the word ¡°STOP¡± should reappear in the lower right corner, if equipped. You will now notice the yellow overload light has gone out. While it is possible to start spinning again simply by rotating the RPM knob at this point, we advise you to push down smartly the Emergency Stop Button and investigate the cause of the overload. Once you have cleared the situation, then, and only then, should you begin the start up sequence in this section. Note: the big red emergency stop button must be pressed smartly (with some force) to activate the internal shut off system properly. If the green light remains lit, power is still available to the motor, so be sure to press the red button hard-enough to shut down the power.
On Friday, December 29th, 2023 at 5:52 PM, chrisser via groups.io <chris.kucia@...> wrote:
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I have with this type of board pass .
It could a reostat having a dead spot. Just by moving the reostat will clear the problem.?? This is same problem you find with a clock radio and the volume control.?? Next 1 It could even be with brushes.? That easy check just remove and inspect.?? Next 2 I have disconnected the motor from the board and use a 12 volt battery charger to see if motor turns.? If motor turns on charger then replace the board to match the motor. The motor will give data need for new board.? Remember a new board will need to be adjusted for torque and speed. A better board will you better responds at lower speed.? Good luck Dave? |
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I have rechecked everything mentioned and that yielded nothing notable. There was no jamming or anything of the sort.
The switch operates as it should. I still get a fault (yellow lamp is lit. I am not aware of any reset button. The only thing I did that lead up to this condition was that I was moving the lathe and removed the motor to lighten the load. Is there anything else I should be looking at that might be the cause of not being able to start the lathe???? Any input always welcome! Dick |
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Hello Mark,
Good to hear from you. I have the issue solved, finally. A multi pin connector had become disconnected during my reassembly process. It was as simple as that, but took some investigation to zero in on the source. I am very happy I didn¡¯t have to go deeper. The continuity check verified the status of the fuse. |
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Hello, Mark,
I forgot to mention that currently I am spending more and more of my time with my little Unimat lathes. I found out I enjoy machining on the smaller scale machines as well as the 7x16 scale and possibly more so. It can more challenging and that might be what draws me in that direction today. I have Two Unimat DB200 machines. Both about 50 to 60 years old. They have vertical milling capabilities as well. I am a longtime member of that group as well. Have a good evening and enjoy. Dick |
OldToolmaker
chrisser
davesmith1800