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Thread: Using the D bit
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9th January 2015, 02:08 PM #1
Using the D bit
What are the advantages of this D bit ?
http://www.opensourcemachinetools.or...uals/DBits.pdf
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9th January 2015, 02:16 PM #2GOLD MEMBER
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Cheap and easy to make.
Stuart
p.s. it occurs to me that I'm not exactly sure what the question is asking.
Advantages over a "proper" reamer, cheap and easy to make. If you're asking something else the answer may well be different.
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9th January 2015, 02:28 PM #3
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9th January 2015, 03:33 PM #4Senior Member
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9th January 2015, 06:24 PM #5
Do they make a true square bottom??? If the end of the D-bit is angled like in the diagram then the end of the hole should peak in my thoughts.
If it was a flat Square ended D-Bit I don't understand how it would cut well while boring the end to square and not jam up.
In the words of Pauline the Ginger…"Please Explain?"…..Live a Quiet Life & Work with your Hands
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9th January 2015, 07:26 PM #6Senior Member
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Hello the d bit can be used to take out the vee bottom 118 deg included angle until you have a flat base.this is a improvisation tool in a sense that it was usually made out of neccesity more than normal finishing tools.another omission is that it needs to be cleared often and flooded with some form of cutting lubricant.It isused quite succesfully in cast iron due to the chip swarf particle .another thing it is a finishing tool where small amounts of material removed.these tools come from a very early era of machining where treadle power was used and these tools razor sharp then honed. Hope this helps and open to other's input John.