jon burgess Posted September 20, 2015 Report Share Posted September 20, 2015 I have four Irwin bit use for that I do not know what they are used for. Four of them have different numbers. The other two have no writing on them Quote Link to comment Share on other sites More sharing options...
comp56 Posted September 20, 2015 Report Share Posted September 20, 2015 they are known as fostner bits, for drilling thru or flat bottom holes...not that terribly old they were designed long ago to remove knots in wood so the hole could be refilled....but they are used for more and more things and the straight one are called straight flute reamers.....used for very tight tolerance holes Quote Link to comment Share on other sites More sharing options...
jon burgess Posted September 20, 2015 Author Report Share Posted September 20, 2015 Are used on a regular drill or hammer drill Quote Link to comment Share on other sites More sharing options...
DR99 Posted September 20, 2015 Report Share Posted September 20, 2015 Regular drill. They do not have carbide tips for masonry use. Quote Link to comment Share on other sites More sharing options...
jon burgess Posted September 20, 2015 Author Report Share Posted September 20, 2015 I was clean out my grandfather tools, and I thought they where for anther tool that was near it so I thought that those bit went with that tool. I get that they make hole but why would someone need these bit Quote Link to comment Share on other sites More sharing options...
comp56 Posted September 20, 2015 Report Share Posted September 20, 2015 Are used on a regular drill or hammer drillwell you can use either but Ideally a drill press if the hole needs to be perfectly 90 degrees to surface....... Quote Link to comment Share on other sites More sharing options...
Atlas2000 Posted September 20, 2015 Report Share Posted September 20, 2015 Forstner Bits and two reamers Quote Link to comment Share on other sites More sharing options...
jon burgess Posted September 20, 2015 Author Report Share Posted September 20, 2015 what are reamers used for? Quote Link to comment Share on other sites More sharing options...
comp56 Posted September 20, 2015 Report Share Posted September 20, 2015 what are reamers used for?I posted what they are for in first post.. http://professional-power-tool-guide.com/power-tool-forum/index.php?/topic/7546-what-are-these-bit-for/?p=82157 Quote Link to comment Share on other sites More sharing options...
RickyMcGrath Posted October 2, 2015 Report Share Posted October 2, 2015 Yup. Forstner bits. Lots of uses. It can be quite challenging to use in a hand drill as they tend to skip. If you must use in a hand drill, and you have the depth to work with, a pilot hole of the exact same diameter will help with alignment and flatten out the bottom of the hole. Quote Link to comment Share on other sites More sharing options...
Conductor562 Posted October 3, 2015 Report Share Posted October 3, 2015 Forstner's works best in a press Quote Link to comment Share on other sites More sharing options...
EEtwidget Posted November 5, 2015 Report Share Posted November 5, 2015 Forstner bits are used when you need a hole that doesn't go all the way through the material. Using a forstner bit will ensure the bottom of the hole is smooth and the bit will not 'pull through'If you try do drill a hole halfway through material with a regular 'twist' bit, the bit will mostlikly 'pull' too far through the material. A similar bit know as a hole saw is used when you want to bore large holes all the way through material.As for the reamer, ... Drill bits are not exactly precise in diameter. If you needed a hole with a precision tolerance, you would first drill with appropriate twist bit, then come back and 'drill' with the reamer.I assume you're grandfather did some metal work? Often those tools are used with mills & drill-press Quote Link to comment Share on other sites More sharing options...
Conductor562 Posted November 5, 2015 Report Share Posted November 5, 2015 I didn't even catch the reamer. Good catch EET Quote Link to comment Share on other sites More sharing options...
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