COUNTERSINK AND TAP HOLDERS
These 1/2" arbors extend the reach of short 1/4" shanked drilling tools.
I make 3; one for 1/4" taps the other 2 for countersinks, plug cutters, and counter bores.
I make them from .5000" tool steel. The 1/4" hole for the tool shank is ~15/16" deep and pierced with 3 stainless steel set screws.
On many occasions, drilling ops that begin with a countersinking operation but end up being reamed, drilled with a longer drill, tapped or countersunk again, require a table height change. A table height change spoils the setup (on most drill presses). No matter how well fixtured, the work is no longer centered to the quill if the table is rotated, raised, or lowered. Use my arbor and you won't have to make that change.
Drill presses with short quill travel are in the same fix. If an ordinary countersinking operation is first, last, or anywhere in between a long shanked drilling operation, you'll be working in the extremes of the chuck & feed travel ranges. The reamer folks have seen to it that their overall tool lengths are 6 -10"+! As such, there is no way a short shanked, typical countersink operation can follow or precede a ream at the same table height setting. My arbors will obviate these problems, increase accuracy and streamline short production runs.
The accessory is perfect for countersinking and counter boring functions of which there are many (>100 such 1/4" shanked tools exist!). Taps are secured x the shank and square end. Unlike magnetic arbors, tools are very well secured in this arbor. The spindle may be of help to those woodworkers who drill with brad points and would like to countersink for flat head screws. If the work is not moved between the drill and countersink operations, the extended shank countersink will reach the work without a table height change. Expect the countersink to track the center without a pilot*. The plastics fabricator will also benefit. Provided the work** is backed up, ordinary 118 degree drills can be used precisely in plastic if the work is pre-countersunk with a 120 degree countersink. Count on the drill starting on center. Moreover, if the center is preserved, 82 & 90 degree countersinks (for flat head screws) will track right down the hole center, again without a pilot. This also holds true for steel and aluminum. Give them a try. The arbor is well worth one mandatory and unwanted table height change, I say right!
1) 0.5" x 2.5" long arbor with 3 set screws & wrench: $25, includes USPSFC & handling.
Note: .250" x 15/16" hole, centered & reamed.
2) 0.5" x 3.5" long, otherwise as above: $30
3) .5 x 2.5" for 1/4 taps: $25 w/s&h (uses 2 set screws on 11/16" centers).
Note: Tap shank must be .255" or less.
4) There is a 10% discount on the second & subsequent arbors.
Email your order or order by phone (760-747-2623). Send remittance to: PAT WARNER 1427 KENORA STREET ESCONDIDO CA 92027-3940
No third party money handlers. Same day shipping possible.
1) Typical OAL with typical countersink installed: 3.6" & 4.6".
2) Tool shanks must be .250" (typical) or less.
3) Not for CNC, router or high speed applications.
4) Not for 1/4" hex-terminated drivers.
5) Your 1/4" tool shanks must be = or > 5/8" long.
6) Need a special arbor? Ask for quote.
7) Made in the USA x me.
*Conditional, depends on skills, CS design, drill press fitness, feed rate, material, etc, inquire as necessary.
Note: The work can be moved and relocated for progressive operations and returned for on-center countersinking if your fixturing will allow it.
**Acrylic, ABS, Polycarbonate, Phenolic, PVC, PE, & others. Inquire as necessary.
A. Product grouping. 2 arbor lengths for 1/4" tools, a third model for 1/4" taps. Typical short fluted tools.
B. A drilling sequence. 120 degree countersink followed x countersink w/ 5/16" hole drilled with non-plexi 118" degree jobber drill. Then 82 degree countersink on center of 5/16 hole.
Non pilot drilling, all on center. System exploits the free, no chip-clog of pilot less drilling, a big plus in efficiency and hygienics.
C. 1/4" - 1/2" jobber length drills are typically 4" - 6" long. The shortest of reamers are 6"; no way to use a short countersink without a table height change.
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Last modified: Fri Aug 20 07:16:48 PDT 2010