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Post by rob75uk on Mar 17, 2019 13:59:09 GMT
Hi , can anyone help me iv tried every Philips screwdriver I have to adjust the chips voltage to stepper motors and nothing seems to be engaging them , iv even tried my mobile phone drivers . A friend said it could possibly a small torq but the instruction manual says Philips ? Please could someone give me advice 👍🏻
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rcferguson
Full Member
Posts: 182
Machine: Carve King
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Post by rcferguson on Mar 17, 2019 14:22:26 GMT
Hi , can anyone help me iv tried every Philips screwdriver I have to adjust the chips voltage to stepper motors and nothing seems to be engaging them , iv even tried my mobile phone drivers . A friend said it could possibly a small torq but the instruction manual says Philips ? Please could someone give me advice 👍🏻
In a pinch I've just cut a small flat, sharp edge on a toothpick and used that.
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Post by Bruce on Mar 17, 2019 21:23:05 GMT
If you want to measure the voltage as you make the adjustment you will want a metal screw driver, with an alligator clip on the shaft, which is connected to the positive probe of the voltmeter. It might be your screwdriver in not metallic or conductive. You will need a very small P0 or #0 phillips head screwdriver. Similar to this one: www.amzn.com/B007PAKOSG/Here's a checklist of items to get the voltage set on the stepper drivers. 1. Make sure the motors are unplugged from the CNC Shield board. 2. Make sure you have the 24VDC supply connected to the terminals on the red CNC Shield. 3. Connect the USB cable to the PC. 4. Make sure the battery in your multi-meter is good. 5. Set the multi-meter to read 2VDC. (Make sure it is not set to AC) The decimal should move to the left side of the display. 6. If you have alligator clips it will make this next step easier. Put your black lead on the screw (black wire) on the power connector to the CNC shield. 7. Place the red lead on the trim pot of the stepper driver board using a small screwdriver. You should see a voltage range of 0.90 to 0.50 VDC on the multi-meter. turning the trim pot clockwise reduces the voltage, counterclockwise increases.
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Post by Big Man Black T-Shirt(Patrick) on Mar 18, 2019 0:48:55 GMT
Use a small flat blade screwdriver. Those trim pots have a cross slot in them but they are NOT Philips, the point in a Philips screwdriver has nowhere to go in the shallow top of that "screw" and will just spin around, engaging nothing.
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Post by Bruce on Mar 18, 2019 2:26:02 GMT
Well you're right Patrick. Here's a picture of the DRV8825 stepper driver.
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