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crvsecretary
Joined: 18 Mar 2007
Posts: 38
Location: Naugatuck, CT
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 Posted: Sun Nov 13, 2011 4:30 am Post subject: Comment on Reaming vs. Drilling |
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Gentlemen:
I was reading yesterday's comments on drilling & reaming holes and thought I'd add a comment or two:
Reaming is a precision cutting operation where the accuracy is determined by the size of the reamer and the skill of the operator using it. It is a finishing operation.
Most drilling operations will produce an oversize (to the order of a couple of tenths) out-of-round hole. Mind you, I'm talking VERY small amounts here - and reaming puts the hole back to the intended dimensions: accurately sized and perfectly round.
With regard to the 'pulling vs. pushing' discussion, is it possible the reamer chucked in the drill motor is sharper at the shaft end - maybe due to lack of cutting oil when reaming, or maybe trying to ream too much material? Maybe the shaft acts to help the operator center the reamer in the hole, making the operation much easier?
Just a few thoughts - no criticism or negativity implied.
Regards,
Tracy Smith
Zenith 601/651
[quote][b]
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_________________
Zenith 601XL N458XL (reserved)
Naugatuck, CT
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Sun Nov 13, 2011 3:35 pm Post subject: Comment on Reaming vs. Drilling |
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Tracy & Gaggle:
Pull out a Machinist Handbook and look up Drilling & Reaming.
From statements, I am gathering that people are doing both operations using a Hand Drill. If so the quality and accuracy of the Reamer will be (guess factor number here) only a 50% improvement over Drilling. Drilling is used to remove large quantities of material while Reaming removes smaller quantities. Reaming can be done with 3, 4, 6 or more flutes. The more flutes the less is removed on each pass but the smoother and more uniform the hole. PRICE of the reamer goes up with the number of flutes.
To obtain a proper ream it should not be done with a hand drill.
Most Reamers have a LEAD-IN at both ends. Sharpness is NOT an issue, at one end or another. The flutes do the cutting. All your tools should be sharp! One of the longest things to learn in a machine shop is how to sharpen your tools. Really you never stop learning that.
There are many things that determine if you push or pull the reamer.
Direction of chips.
Access.
Length of stroke.
Direction of oil feed.
Tools being used to operate the reamer - MANY a HAND DRILL can not be used in the PULLING operation due to cheap-ass design <--- I learned that the expensive way. They are to be used pushing only. DRILL BITS are designed for pushing only. <--- Don't think I really needed to say that 
What one must consider in the tool is the quality. Today you do NOT get what you pay for. The steels coming from china are extremely poor. And finding good tools are becoming harder and harder. I have tools from 50 years ago and they hold an edge and take an edge very well. Brand new tools today - Well, we are a throw away society and the tools reflect that.
Barry
Machine Shop 101
On Sun, Nov 13, 2011 at 7:27 AM, TRACY SMITH <crvsecretary(at)aol.com (crvsecretary(at)aol.com)> wrote:
[quote] Gentlemen:
I was reading yesterday's comments on drilling & reaming holes and thought I'd add a comment or two:
Reaming is a precision cutting operation where the accuracy is determined by the size of the reamer and the skill of the operator using it. It is a finishing operation.
Most drilling operations will produce an oversize (to the order of a couple of tenths) out-of-round hole. Mind you, I'm talking VERY small amounts here - and reaming puts the hole back to the intended dimensions: accurately sized and perfectly round.
With regard to the 'pulling vs. pushing' discussion, is it possible the reamer chucked in the drill motor is sharper at the shaft end - maybe due to lack of cutting oil when reaming, or maybe trying to ream too much material? Maybe the shaft acts to help the operator center the reamer in the hole, making the operation much easier?
Just a few thoughts - no criticism or negativity implied.
Regards,
Tracy Smith
Zenith 601/651
| Quote: |
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arget="_blank">http://www.matronics.com/Navigator?Zenith-List
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Afterfxllc(at)aol.com
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| Posted: Mon Nov 14, 2011 7:36 pm Post subject: Comment on Reaming vs. Drilling |
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I wonder what they did before they had reamers? They must have invented reamers because of airplane spars......
In a message dated 11/13/2011 6:36:14 P.M. Eastern Standard Time, flyadive(at)gmail.com writes:
| Quote: | Tracy & Gaggle:
Pull out a Machinist Handbook and look up Drilling & Reaming.
From statements, I am gathering that people are doing both operations using a Hand Drill. If so the quality and accuracy of the Reamer will be (guess factor number here) only a 50% improvement over Drilling. Drilling is used to remove large quantities of material while Reaming removes smaller quantities. Reaming can be done with 3, 4, 6 or more flutes. The more flutes the less is removed on each pass but the smoother and more uniform the hole. PRICE of the reamer goes up with the number of flutes.
To obtain a proper ream it should not be done with a hand drill.
Most Reamers have a LEAD-IN at both ends. Sharpness is NOT an issue, at one end or another. The flutes do the cutting. All your tools should be sharp! One of the longest things to learn in a machine shop is how to sharpen your tools. Really you never stop learning that.
There are many things that determine if you push or pull the reamer.
Direction of chips.
Access.
Length of stroke.
Direction of oil feed.
Tools being used to operate the reamer - MANY a HAND DRILL can not be used in the PULLING operation due to cheap-ass design <--- I learned that the expensive way. They are to be used pushing only. DRILL BITS are designed for pushing only. <--- Don't think I really needed to say that
What one must consider in the tool is the quality. Today you do NOT get what you pay for. The steels coming from china are extremely poor. And finding good tools are becoming harder and harder. I have tools from 50 years ago and they hold an edge and take an edge very well. Brand new tools today - Well, we are a throw away society and the tools reflect that.
Barry
Machine Shop 101
On Sun, Nov 13, 2011 at 7:27 AM, TRACY SMITH <crvsecretary(at)aol.com (crvsecretary(at)aol.com)> wrote:
| Quote: | Gentlemen:
I was reading yesterday's comments on drilling & reaming holes and thought I'd add a comment or two:
Reaming is a precision cutting operation where the accuracy is determined by the size of the reamer and the skill of the operator using it. It is a finishing operation.
Most drilling operations will produce an oversize (to the order of a couple of tenths) out-of-round hole. Mind you, I'm talking VERY small amounts here - and reaming puts the hole back to the intended dimensions: accurately sized and perfectly round.
With regard to the 'pulling vs. pushing' discussion, is it possible the reamer chucked in the drill motor is sharper at the shaft end - maybe due to lack of cutting oil when reaming, or maybe trying to ream too much material? Maybe the shaft acts to help the operator center the reamer in the hole, making the operation much easier?
Just a few thoughts - no criticism or negativity implied.
Regards,
Tracy Smith
Zenith 601/651
| Quote: |
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
_blank">http://www.matronics.com/contribution
arget="_blank">http://www.matronics.com/Navigator?Zenith-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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tp://www.aeroelectric.com/">www.aeroelectric.com
/ href="http://www.buildersbooks.com/">www.buildersbooks.com
http://www.homebuilthelp.com/">www.homebuilthelp.com
p://www.matronics.com/contribution">http://www.matronics.com/contribution
ef="http://www.matronics.com/Navigator?Zenith-List">http://www.matronics.com/Navigator?Zenith-List
s.matronics.com/">http://forums.matronics.com
p://www.matronics.com/contribution">http://www.matronics.com/contribution
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[quote][b]
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Tue Nov 15, 2011 4:04 am Post subject: Comment on Reaming vs. Drilling |
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Reamers have been around for thousands of years.All the way back to the ancient Egyptians.
They were used on the chariot wheels.
It was a military advantage back then to have a smooth round axle and spindle.
Barry
On Mon, Nov 14, 2011 at 10:32 PM, <Afterfxllc(at)aol.com (Afterfxllc(at)aol.com)> wrote:
[quote] I wonder what they did before they had reamers? They must have invented reamers because of airplane spars......
In a message dated 11/13/2011 6:36:14 P.M. Eastern Standard Time, flyadive(at)gmail.com (flyadive(at)gmail.com) writes:
| Quote: |
Tracy & Gaggle:
Pull out a Machinist Handbook and look up Drilling & Reaming.
From statements, I am gathering that people are doing both operations using a Hand Drill. If so the quality and accuracy of the Reamer will be (guess factor number here) only a 50% improvement over Drilling. Drilling is used to remove large quantities of material while Reaming removes smaller quantities. Reaming can be done with 3, 4, 6 or more flutes. The more flutes the less is removed on each pass but the smoother and more uniform the hole. PRICE of the reamer goes up with the number of flutes.
To obtain a proper ream it should not be done with a hand drill.
Most Reamers have a LEAD-IN at both ends. Sharpness is NOT an issue, at one end or another. The flutes do the cutting. All your tools should be sharp! One of the longest things to learn in a machine shop is how to sharpen your tools. Really you never stop learning that.
There are many things that determine if you push or pull the reamer.
Direction of chips.
Access.
Length of stroke.
Direction of oil feed.
Tools being used to operate the reamer - MANY a HAND DRILL can not be used in the PULLING operation due to cheap-ass design <--- I learned that the expensive way. They are to be used pushing only. DRILL BITS are designed for pushing only. <--- Don't think I really needed to say that
What one must consider in the tool is the quality. Today you do NOT get what you pay for. The steels coming from china are extremely poor. And finding good tools are becoming harder and harder. I have tools from 50 years ago and they hold an edge and take an edge very well. Brand new tools today - Well, we are a throw away society and the tools reflect that.
Barry
Machine Shop 101
On Sun, Nov 13, 2011 at 7:27 AM, TRACY SMITH <crvsecretary(at)aol.com (crvsecretary(at)aol.com)> wrote:
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| Quote: |
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
_blank">http://www.matronics.com/contribution
arget="_blank">http://www.matronics.com/Navigator?Zenith-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
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