Precision Hole Reaming Video
Summary
TLDRThis video tutorial instructs viewers on achieving a precision-sized hole using a reamer. It explains that standard drills tend to enlarge the hole, so a reamer is necessary for exact sizing. The video demonstrates the process of pre-drilling a hole undersized by 1/64 inch and then using a reamer at half the drill's RPM and double the feed rate to refine the hole to the desired 0.375-inch size. It emphasizes the importance of maintaining adequate pressure and using cutting fluid for optimal results.
Takeaways
- ⚒️ Drills typically produce holes slightly larger than their size due to their sharpening angle and the blunt chisel point formed where the flutes meet.
- 🔩 To achieve an exact hole size, a reamer is used, which is sharpened differently from a drill and requires a pre-drilled hole that is undersized.
- 🛠️ Reamers are available in standard sizes, but custom sizes can be ordered to meet specific requirements for non-standard hole sizes.
- ⚙️ The RPM for a reamer should be half of what it would be for a drill, and the feed rate should be doubled to ensure a precise and clean cut.
- 🔧 Pre-drilling a hole 1/64 of an inch smaller than the desired finished size is recommended to allow the reamer to make fine adjustments without taking heavy cuts.
- 💧 Cutting fluid is used during the reaming process, especially for specific materials like aluminum or steel, to improve the cutting efficiency and tool life.
- 🔬 The reaming process requires maintaining adequate pressure to prevent the tool from running out of round, ensuring a precise and accurate hole size.
- 📏 The video demonstrates the use of a 3/8 inch reamer to produce a 0.375 inch hole, showcasing the precision achievable with the correct reaming technique.
- 🔧 Reamers are not designed to produce their own holes; they are meant to refine a pre-drilled hole to the exact desired size.
- 👁️🗨️ The importance of visual inspection and monitoring the reaming process is highlighted, as it helps in achieving the desired hole size and quality.
Q & A
What is the typical tool used to create a hole in a material?
-A drill or drill bit is typically used to create a hole in a material.
Why does a drill bit tend to produce a hole slightly larger than its size?
-A drill bit tends to produce a hole slightly larger than its size because the included angle of the drill bit is 118 degrees, and where each flute comes together, it forms a blunt chisel point, causing the drill to run a little out of round.
What is the purpose of using a reamer in hole production?
-A reamer is used to produce a hole of an exact size, especially when there are requirements for a mating component to fit comfortably or for a press fit.
How is a reamer different from a drill bit in terms of sharpening?
-A reamer is sharpened totally different from a drill bit. It cannot produce its own hole and requires a pre-drilled hole to be undersized before the reamer is used to finish the job and bring the hole to the desired size.
What is the standard procedure for using a reamer?
-To use a reamer, one must pre-drill the hole undersized and then use the reamer to finish the job, bringing the hole to the desired size.
Why is it important to pre-drill the hole undersized for a reamer?
-The hole should be pre-drilled 1/64 smaller than the finished size because reamers are not designed to take heavy cuts.
How does the RPM for a reamer differ from that of a drill bit?
-The RPM for a reamer should be half of what it would be if the reamer were a drill bit.
What is the recommended feed rate when using a reamer?
-The recommended feed rate when using a reamer is twice the feed rate of a drill bit.
What is the purpose of using cutting fluid when reaming?
-Cutting fluid is used to reduce friction and heat, and to help in the cutting process, especially when reaming materials like aluminum or steel.
How can one ensure that the reamer produces an exact size hole?
-To ensure an exact size hole, one should keep an adequate amount of pressure on the reamer to prevent it from running out of round, and maintain a consistent feed rate.
What size hole was produced in the example given in the script?
-In the example, a 3/8 reamer was used to produce a hole with an exact size of 0.375 inches.
Outlines
🛠️ Precision Hole Production with a Reamer
This paragraph introduces the process of creating a precision-sized hole using a drill bit and a reamer. It explains that a drill bit, sharpened with a 118-degree included angle, tends to produce a hole slightly larger than its size due to its blunt chisel point. To achieve an exact hole size, a reamer is used after pre-drilling the hole undersized. Reamers are designed differently from drill bits and require a different approach to speed and feed rates. The recommended practice is to use half the speed of a drill and twice the feed rate for the reamer. The paragraph also mentions the use of cutting fluid suitable for the material being worked on, in this case, aluminum. The process is demonstrated with a 3/8 reamer to achieve a 0.375-inch hole size, emphasizing the importance of pre-drilling the hole 1/64 of an inch smaller than the desired finished size.
Mindmap
Keywords
💡Precision-sized hole
💡Drill bit
💡Included angle
💡Flute
💡Reamer
💡Undersize
💡RPM (Revolutions Per Minute)
💡Feed
💡Cutting fluid
💡Press fit
Highlights
The necessity of producing a precision-sized hole for mating components that need to fit comfortably or be press-fit.
Drills tend to produce holes slightly larger than their size due to their sharpening angle and blunt chisel point.
The use of a reamer to achieve an exact hole size after pre-drilling the hole undersized.
Reamers are not designed to produce their own hole and require a pre-drilled hole to work on.
Standard sizes of reamers are available, but special sizes can be ordered for specific needs.
The reaming process requires a different RPM calculation compared to drilling, using half the speed of a drill.
Feed rate during reaming should be double that of drilling to ensure a proper cut.
Maintaining adequate pressure on the reamer prevents the hole from running out of round.
The importance of using cutting fluid designed for specific materials like aluminum or steel.
Demonstration of reaming a hole with a 3/8 reamer to achieve an exact 0.375-inch hole size.
Pre-drilling the hole 1/64 inch smaller than the finished size to avoid heavy cuts with the reamer.
The reaming process is not intended for heavy cuts, which is why the speed and feed are adjusted.
The practical application of reaming in achieving precise hole sizes for engineering and manufacturing purposes.
The importance of using the correct RPM and feed rate for optimal reaming results.
The step-by-step process of reaming, from pre-drilling to applying cutting fluid and maintaining feed.
The role of reamers in ensuring a comfortable fit or press-fit for mating components.
The practical demonstration of reaming a hole to an exact 0.375-inch size using a 3/8 reamer.
Transcripts
in this video
we're going to take a look at how to
produce a precision
sized hole we have to realize that
when we produce the hole originally
we typically will be using some sort of
a drill or some people refer to it as a
drill bit
and the way this is sharpened remember
the included angle
is 118 degrees and where
each flute comes together it forms
rather
a blunt chisel point
and when the drill is drilling it has a
tendency to run a little bit out of
round so the drill will always produce a
hole
slightly larger than itself so
oftentimes
we need to produce a hole of an exact
size
there might be a mating component that's
going to need to slide in
very comfortably or maybe the mating
component has to be a press fit
regardless we do have requirements
that we have to fulfill in terms of
hitting an exact hole size
and one way to do that kind of a basic
way of doing that
is using a cutting tool called a reamer
the reamer is sharpened totally
different from a drill
it cannot produce its own hole we have
to pre-drill the hole
under size and let the reamer finish the
job
bringing the hole to that desired size
reamers again generally come to us
in standard size it is possible to order
special reamers
but there's another process that we'll
look at
to help us size holes that are not a
standard
size because the reamer is sharpened
different from a drill we do not use a
regular
rpm formula we would calculate
the rpm as if the reamer were a drill
and we take half of that rpm so we the
simple rule to remember for a reamer
is to take half the speed and
twice the feed so we want to keep an
adequate amount of pressure on that
reamer
so it doesn't have a tendency to run out
of round
so i've pre-drilled we're ready to go
but i think i'm going to adjust the
camera a little bit
so that you can see what's happening a
little better
so we're ready to go
i'm going to be running this i will make
an adjustment i'm in the high range
i need to bring that lever up and speed
a little bit
and i will use a little cutting fluid
again
this cutting fluid is used designed to
cut aluminum
we also have some to cut steel
just a little bit of fluid on there and
then
i'll take my coil handle you'll see that
i'm going to keep a nice
solid feed going through
and back out
and at that point i can be guaranteed
that i produced a an exact size hole
in this case i've chosen a 3 8 reamer
and 3 aces 0.375 so my hole would be
exactly
0.375 so we want to remember that
that a reamer can be used to produce an
exact size hole
we always want to drill the hole
pre-drill the hole
1 64 smaller than the finished size 1 64
of an
inch so the reamer is not designed to
take heavy cuts
and we use half the speed f the rpm
and twice the feed
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