How many RPM for drilling glass?
- Thread starter rockethippo
- Start date
Drilling glass is actually more of a grinding process than what goes on when drilling wood. The higher the RPMs, the higher the heat, which is very bad for diamond bits. Cooling the diamond bit with water is essential. I don't know what the actual recommended RPM level is for glass drilling, but when I did it with my variable speed drill I was barely squeezing the trigger and it worked out great. From a visual standpoint, there were some markings on the bit and it was spinning just fast enough for them to blur together from the rotation.
i just started off with a low RPM to get the cut started, then, once i was off, open the drill to max...its only the initial start cut the is best done at low RPM...just keep it cool with a dam and water...
Niko
Niko
low RPM all the way through would be better.
Also keep in mind that the heat friction is determined by the speed of the outside edge of the hole saw and large diameter hole saws need to be run at lower RPM than small diameter saws. Here's some info on recommended speeds per hole saw diameter taken from this site: http://www.diamond-drill-bit-and-tool.com/Diamond-Drill/MAIN.htm Navigate to diamond drill - diamond drilling techniques
The following table shows recommended drill speeds for HK Diamond Core Drill Bits. Drill speeds considerably in excess of these speeds will quickly burn up the diamond bits. Reduced drill speeds, low drill pressure and use of water for lubrication will extend drill bit life.
[SIZE=-1]Recommended Drill Speed (rpm)[/SIZE]
[SIZE=-1]Material Bit Size --> [/SIZE][SIZE=-1]1/2" [/SIZE][SIZE=-1]1" [/SIZE][SIZE=-1]2" [/SIZE][SIZE=-1]3" [/SIZE][SIZE=-1]4"[/SIZE]
[SIZE=-1]Glass 800 [/SIZE][SIZE=-1]500 [/SIZE][SIZE=-1]250 [/SIZE][SIZE=-1]160 [/SIZE][SIZE=-1]125[/SIZE]
[SIZE=-1]SPEED KILLS: [/SIZE][SIZE=-1]Reduced [/SIZE][SIZE=-1]drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.[/SIZE]
Since all materials vary in hardness and abrasiveness, it is impossible to determine exact drill speeds. Additionally, as discussed below, lubrication and drill pressure must also be considered when determining the proper drill speed. A faster drill speed or increased pressure may reduce the cutting time slightly, but it will also increase the friction significantly and heat up the bit, reducing the bit life considerably and increasing the risk of heat fractures and material breakage. If used properly, a diamond drill bit should never be more than warm when touched after use. If a drill bit develops yellow, brown, blue or black 'burn marks' around the tip, it is an indication of extreme heat and that the drill speed being used is too fast or the amount of pressure on the drill is too great.
Also keep in mind that the heat friction is determined by the speed of the outside edge of the hole saw and large diameter hole saws need to be run at lower RPM than small diameter saws. Here's some info on recommended speeds per hole saw diameter taken from this site: http://www.diamond-drill-bit-and-tool.com/Diamond-Drill/MAIN.htm Navigate to diamond drill - diamond drilling techniques
The following table shows recommended drill speeds for HK Diamond Core Drill Bits. Drill speeds considerably in excess of these speeds will quickly burn up the diamond bits. Reduced drill speeds, low drill pressure and use of water for lubrication will extend drill bit life.
[SIZE=-1]Recommended Drill Speed (rpm)[/SIZE]
[SIZE=-1]Material Bit Size --> [/SIZE][SIZE=-1]1/2" [/SIZE][SIZE=-1]1" [/SIZE][SIZE=-1]2" [/SIZE][SIZE=-1]3" [/SIZE][SIZE=-1]4"[/SIZE]
[SIZE=-1]Glass 800 [/SIZE][SIZE=-1]500 [/SIZE][SIZE=-1]250 [/SIZE][SIZE=-1]160 [/SIZE][SIZE=-1]125[/SIZE]
[SIZE=-1]SPEED KILLS: [/SIZE][SIZE=-1]Reduced [/SIZE][SIZE=-1]drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.[/SIZE]
Since all materials vary in hardness and abrasiveness, it is impossible to determine exact drill speeds. Additionally, as discussed below, lubrication and drill pressure must also be considered when determining the proper drill speed. A faster drill speed or increased pressure may reduce the cutting time slightly, but it will also increase the friction significantly and heat up the bit, reducing the bit life considerably and increasing the risk of heat fractures and material breakage. If used properly, a diamond drill bit should never be more than warm when touched after use. If a drill bit develops yellow, brown, blue or black 'burn marks' around the tip, it is an indication of extreme heat and that the drill speed being used is too fast or the amount of pressure on the drill is too great.
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