lewisc Posted May 18, 2016 Report Share Posted May 18, 2016 (edited) I'm trying to bore out a hole for a clock movement in the back of some 19mm pine. I bought this https://www.carbatec.com.au/drilling-and-boring/sawtooth-bit-3-1-8 and it's not cutting as it should. I know it's a cheap bit - are the others like it which would be better? I've tried the following: Various speeds on the drill press - including the slowest, Drill a few holes to remove some material to maybe make it easier Just as soon as it touches the timber, it stops and nothing cuts. What else could I try to get the result I'm looking for? Edited May 18, 2016 by lewisc Add video Quote Link to comment Share on other sites More sharing options...
wdwerker Posted May 18, 2016 Report Share Posted May 18, 2016 Sounds like your Chuck is slipping on the drill press. Quote Link to comment Share on other sites More sharing options...
Larry Moore Posted May 18, 2016 Report Share Posted May 18, 2016 It may be the belt slipping. I have a cheap variable speed drill press that the belt slips on big forestner bits. Quote Link to comment Share on other sites More sharing options...
byegge Posted May 18, 2016 Report Share Posted May 18, 2016 +1 to this. Tighten that belt 53 minutes ago, Larry Moore said: It may be the belt slipping. I have a cheap variable speed drill press that the belt slips on big forestner bits. +1 to this. Tighten that belt Quote Link to comment Share on other sites More sharing options...
drzaius Posted May 18, 2016 Report Share Posted May 18, 2016 The belt or chuck is definitely slipping, but when the bit is turning there doesn't seem to be much cutting happening. I don't see any big shavings coming out. The edge teeth are cutting though. Sometimes shavings will fold over & get stuck on the main cutter edges preventing further progress. I've got a set of HSS sawtooth bits from Lee Valley & they are very good. They cut well & leave a very clean hole. 1 Quote Link to comment Share on other sites More sharing options...
Rapid Roger Posted May 18, 2016 Report Share Posted May 18, 2016 I agree that it is more than likely the belts are slipping. Are you pushing the motor back to tighten the belts well and tightening the thumb screw that holds it in place? It also helps when inserting a bit in the chuck that you tighten it at all three places around the chuck. I know that that sounds funny but, it really does make a difference in how the chuck holds the shank of the bit. Rog 1 Quote Link to comment Share on other sites More sharing options...
gee-dub Posted May 18, 2016 Report Share Posted May 18, 2016 As already stated, no need to try another bit until you get the DP to spin this one. Quote Link to comment Share on other sites More sharing options...
wdwerker Posted May 18, 2016 Report Share Posted May 18, 2016 Once you get the drill press issues figured out you can check the sharpness of the bit. Use a magnifying glass or a magnifying headpiece (like jeweler's use) and compare the edge on the 3 1/8 bit to one of your higher quality bits. Sometimes a few careful strokes with a set of diamond paddles is all it takes. Other times a fine file followed by the diamond paddles is needed. Or send it out with your saw blades if you don't have an interest(or the tools) to sharpen it. Quote Link to comment Share on other sites More sharing options...
lewisc Posted May 18, 2016 Author Report Share Posted May 18, 2016 Thank you! I'll try to get some extra tension on the belt. Hopefully that should solve the issue. 8 hours ago, Rapid Roger said: I agree that it is more than likely the belts are slipping. Are you pushing the motor back to tighten the belts well and tightening the thumb screw that holds it in place? It also helps when inserting a bit in the chuck that you tighten it at all three places around the chuck. I know that that sounds funny but, it really does make a difference in how the chuck holds the shank of the bit. Rog Yeah, I tightened the thumb screw. Just need to see if I can get the motor back a bit further. Update: All the belts are tight. I even found a nut that was not as tight as it should be. The bit is cutting as it should. Thanks for your help. Quote Link to comment Share on other sites More sharing options...
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