Variable speed grinder model 315.17340

If you've replaced the variable speed unit in your Bosch 11318EVS SDS-max Demolition Hammer and the variable speed is still not working, there could be a few potential reasons for this issue. Here are some steps you can take to troubleshoot and address the problem:

1. Check Wiring Connections: Ensure that all wiring connections related to the variable speed control are properly connected and secure. Loose or damaged wires can disrupt the variable speed function.
2. Control Switch: The control switch itself could be faulty. Test the switch to make sure it's functioning as intended. Use a multimeter to check for continuity across the switch terminals in different speed settings.
3. Speed Control Potentiometer: The potentiometer, which is responsible for adjusting the variable speed, could be malfunctioning. Test the potentiometer with a multimeter to ensure it's changing resistance smoothly as you adjust the speed.
4. Electronic Control Board: The issue could be with the electronic control board that governs the variable speed function. Inspect the board for any signs of damage, such as burnt components or solder joints.
5. Brushes and Carbon Motor Contacts: Worn brushes or carbon motor contacts can affect the motor's performance and, consequently, the variable speed control. Check the condition of the brushes and motor contacts and replace them if necessary.
6. Power Supply and Voltage: Ensure that the tool is receiving the correct power supply and voltage. Incorrect power supply can affect the tool's overall performance.
7. Manufacturer's Support: If you've exhausted your troubleshooting efforts and the variable speed is still not working, it's advisable to contact Bosch customer support or a professional tool technician. They can provide more specific guidance based on the model and diagnose the issue accurately.
8. Professional Repair: If the issue is complex or involves internal components, it might be best to seek the assistance of a professional tool repair technician who has experience with Bosch power tools.

Remember that working with power tools and electrical components carries inherent risks. If you're not comfortable or experienced with tool repairs, it's recommended to seek professional assistance to ensure safety and prevent further damage to the tool.

I would replace the capacitor anyway as they are cheap. If it is the PCB, there isn't much on it, a transformer, some resistors and a component with a heat sink probably a triac. You could take that to a good electronics engineer and they could test it at component level.

It must be very old, there are no parts at all.

https://www.google.com/search?q=Craftsman+grinder+152.211620+parts

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It's possible that the variable speed control may be the issue with your Delta 23-197 grinder. However, before attempting to bypass it, there are a few other things you can check.
First, make sure that the grinder is properly plugged in and that the power outlet is functioning correctly. Check the power cord and make sure that there are no cuts or breaks in the cord.
Next, check the switch and make sure that it is properly engaged. If the switch is faulty, it may need to be replaced.
You can also check the brushes on the motor to see if they are worn out or damaged. If the brushes are worn out, they will need to be replaced.
If none of these troubleshooting steps resolve the issue, it may be possible to bypass the variable speed control. However, this is not recommended unless you have experience with electrical wiring and understand the risks involved.
If you do decide to bypass the variable speed control, you will need to identify the wiring that controls the speed control and connect the wires together to bypass the control. However, keep in mind that this will result in the grinder running at full speed all the time and may shorten the life of the motor. It's always best to have a qualified electrician or technician perform any electrical modifications to your tools.

JAMES THERE SHOULD BE A SITE ON THE INTERNET WHERE YOU COULD CALL SANSUNG CUSTOMER SUPPORT TAKE A LOOK!

This is an electric die grinder? Do a quick Google search for "Router speed control". That'll work fine for any electric die grinder.

Not sure about the actual voltage, but the primary power board shows 94 V @ 2A. As this appears to be a variable speed drive, the voltage amplitude should vary depending on the speed potentiometer setting. The most likely culprit is the speed potentiometer. Poor design causes vibrations on the printed circuit board. This induces metal fatigue in the potentiometer terminations at the board. Eventually one or more terminals snap off. You could try removing the pot and connecting the wiper termination connection directly to the relative end for full speed? This is assuming you want it to run at full speed? Failing that you could try variable resistance settings and then replace the pot with a fixed resistance for the required final speed?

i woulkd take switch off and rewire it. It is not a very difficult thing to do. As you take it apart just pay atention to where the speed control wires are running from and go from there. If it still dosent work than the switch is burnt out

does it run freely?as in not seem to be lugging from bad bearings in the motor shaft,then check the speed control board for a shorted triac/scr transistor

If it is under warranty, take it back. If not then it is a simple matter of replacing the switch. Take off the cover and pull out the switch. Mark each wire as you take it off. Take the switch with you to the store. First try a hardware store, then an auto parts store. If they don't have it try Sears. They will probably be able order it. Make sure you have the model number of your grinder. It is on a data plate somewhere on the grinder. If Sears can't get it, try a wholesale electrical parts house.

You can check the online parts manual

however it doesn't give the size of the wheel, only the part number of which there are two

23269 and 23270