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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Drilling 1.5 mm holes in 6 mm stainless rods?
I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm
OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill and a decent drill press. I have pin drill chucks to taske small drill bits. What's the best way to drill say 50 of these pins with good efficiency and little chance of breaking drill bits in them please? Best bits to use? Thanks. |
#2
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Drilling 1.5 mm holes in 6 mm stainless rods?
On Dec 16, 4:19*pm, Chris Wilson wrote:
I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill and a decent drill press. I have pin drill chucks to taske small drill bits. What's the best way to drill say 50 of these pins with good efficiency and little chance of breaking drill bits in them please? Best bits to use? Thanks. Carpenter Tech has a web site with a book on Machining Stainless Steel. That is probably not the exact title. Anyway they have a whole chapter on drilling stainless steel. Worth reading. And worth reading before you get the stainless rods so you can see what the relative problems are between grades of stainless. Stainless likes more clearance than regular steel and it work hardens. So never take real light cuts. Dan |
#3
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Drilling 1.5 mm holes in 6 mm stainless rods?
On Thu, 16 Dec 2010 21:19:01 +0000, Chris Wilson
wrote: I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill and a decent drill press. I have pin drill chucks to taske small drill bits. What's the best way to drill say 50 of these pins with good efficiency and little chance of breaking drill bits in them please? Best bits to use? Thanks. The most important thing is to use type a free machining grade of SS. Type 303 if you want a 300 series material. If you want even easier go to http://us.misumi-ec.com/us/ItemDetail/10300095140.html, pick the CAD configurator tab, then the "L Dimension Configurable - Fixed " dropdown, and specify the length and material for your parts. $1.20 each for 6mm SS. -- Ned Simmons |
#4
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Drilling 1.5 mm holes in 6 mm stainless rods?
"Chris Wilson" wrote in message
... I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill and a decent drill press. I have pin drill chucks to taske small drill bits. What's the best way to drill say 50 of these pins with good efficiency and little chance of breaking drill bits in them please? Best bits to use? Thanks. I guess you might already know this but... Use coolant. Oil if you can. The moment the drill is dry, it is done. If you have that many to do, may even build a little "clay" dam around the part and submerge it in coolant because your hole is a bit deep for a simple bursh-on or spray on coolant to work at 4 x the diameter. -- Regards, Joe Agro, Jr. (800) 871-5022 01.908.542.0244 Automatic / Pneumatic Drills: http://www.AutoDrill.com Multiple Spindle Drills: http://www.Multi-Drill.com Production Tapping: http://Production-Tapping-Equipment.com/ Flagship Site: http://www.Drill-N-Tap.com VIDEOS: http://www.youtube.com/user/AutoDrill TWITTER: http://twitter.com/AutoDrill FACEBOOK: http://tinyurl.com/AutoDrill-Facebook V8013-R |
#5
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Drilling 1.5 mm holes in 6 mm stainless rods?
On Thu, 16 Dec 2010 21:19:01 +0000, Chris Wilson
wrote: I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill and a decent drill press. I have pin drill chucks to taske small drill bits. What's the best way to drill say 50 of these pins with good efficiency and little chance of breaking drill bits in them please? Best bits to use? Thanks. =========== Given that you have 50 of these parts to make, I suggest making some sort of fixture to hold the pin with drill guidance to avoid breakage as the drill is sure to want to "walk." If you are careful drilling the drill hole in the fixture you most likely won't need to use a drill bushing, although these are cheap and allow you to change drill size. for example. A quality HSS or Cobalt 135 degree point screw machine drill will most likely give you the best results. The 135 degree point will minimize walking and the shorter screw machine length will reduce drill flex. For some ideas see http://www.carrlane.com/Catalog/inde...3C3B28535A405A http://www.broncotool.com/drill-bush...FcXD7Qod8mrVmA http://www.acmeindustrial.com/MetricPlainPressFit.htm You may also want to consider using drill bushings to locate the pin in the fixture if different pin sizes are possible. Another possibility is to adapt a v block to both clamp the pin and locate the drill bushing. Something like the Versa clamp but with two bridges. One to locate the drill bushing and one to hold the clamp screw. http://www.use-enco.com/CGI/INPDFF?PMPAGE=394&PMCTLG=00 My suggestion is to use the Bridgeport, with the fixture in the mill vise, coolant if possible or at least a solder brush and lots of cutting oil, never let the drill rub as most grades of stainless are *VERY* prone to rapid work hardening -- use the automatic quill feed if possible. Be sure to lock the table and that every thing is square/aligned. Let the group know what you decide and how you make out. Where are you located? -- Unka George (George McDuffee) ............................... The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953). |
#6
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Drilling 1.5 mm holes in 6 mm stainless rods?
On Dec 16, 1:19*pm, Chris Wilson wrote:
I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole Make a jig that consists of a steel block with a hole to fit your pins, hacksaw slotted so it tightens in the mill vise. The jig will have to attach firmly to the fixed jaw, of course. Use heavy-duty cobalt drills, sharp ones. Drill the pilot hole in the jig with centering as accurate as you can manage, using a center drill to start it. Then, produce pins. Cooling is going to be mainly by conduction to the work, lubrication is key, and NEVER slack off the drill pressure while in the hole. The RPM will be critical; for 1.5mm, you'll want something in the 2000 - 4000 RPM range (this is fast for a big drill, but is kinda slow for this small one). |
#7
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Drilling 1.5 mm holes in 6 mm stainless rods?
--You don't say how long the pins are but if they're long enough you
can do a setup with soft jaws on the mill: clamp the jaws on a piece of shim stock, drill a 6mm hole, remove shim and clamp pin. Now make an 'external' drill bushing; i.e. a shallow 6mm hole in one end and your 1.5mm hole straight thru. Put a handle on it so it won't spin. Plunk bushing on top of pin and drill away. --I have a production job where I have to drill and tap both ends of 6" long 1/4" dia stainless rods and this is a *lot* faster than doing it in a lathe. I do it on a drillpress with a 5-C collet closer because length of rods is more than range of Z travel on the mill when running the Tapmatic but you get the idea. -- "Steamboat Ed" Haas : Steel, Stainless, Titanium: Hacking the Trailing Edge! : Guaranteed Uncertified Welding! www.nmpproducts.com ---Decks a-wash in a sea of words--- |
#8
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Drilling 1.5 mm holes in 6 mm stainless rods?
On 2010-12-16, Chris Wilson wrote:
I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill You have a *what*? I didn't think that Bridgeport ever made a universal mill (X-axis table swivels). Perhaps you mean a *vertical* mill? and a decent drill press. I have pin drill chucks to taske small drill bits. What's the best way to drill say 50 of these pins with good efficiency and little chance of breaking drill bits in them please? Best bits to use? Thanks. The best way in my mind requires tools which you have not listed. Don't you have a lathe? Ideally with collets to fit the 6mm pins. Fairly high spindle speed suggest a smaller lathe, which probably means 3C collets or even down to WW collets. I'm not familiar with R clips, FWIW. Even something like 150 SFM would take 9700 RPM, which is rather high for either the mill or most drill presses, except for a sensitive drill press. And *which* stainless steel? Some are fairly easy to work, others are quite nasty. Looking at an old Jorgensen steel catalog/handbook, I see SFMs for Stainless steel running from 75 to 160. For a couple of samples: # SFM RPM ======================= 303 100 6468 304 75 4851 316 70 4527 416 160 10348 So -- can your mill or drill press get that kind of spindle speed? How about half of that speed? It really calls for a small lathe -- and likely something like a Taig or Sherline might get the speeds right. And I know that the Taig has a spindle available for WW series collets, which are commonly available in metric sizes in 0.1 mm steps. Good Luck, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#9
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Drilling 1.5 mm holes in 6 mm stainless rods?
On 18 Dec 2010 06:25:36 GMT, "DoN. Nichols"
wrote: On 2010-12-16, Chris Wilson wrote: I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill I'm not familiar with R clips, FWIW. AKA hairpin clips. http://fasteners.hardwarestore.com/1...s--607526.aspx .... It really calls for a small lathe -- and likely something like a Taig or Sherline might get the speeds right. And I know that the Taig has a spindle available for WW series collets, which are commonly available in metric sizes in 0.1 mm steps. A lathe would be more appropriate for axial holes. The OP needs radial holes. -- Ned Simmons |
#10
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Drilling 1.5 mm holes in 6 mm stainless rods?
--Oops never mind my fix: you're 90 degrees away from my method!
-- "Steamboat Ed" Haas : Steel, Stainless, Titanium: Hacking the Trailing Edge! : Guaranteed Uncertified Welding! www.nmpproducts.com ---Decks a-wash in a sea of words--- |
#11
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Drilling 1.5 mm holes in 6 mm stainless rods?
On 2010-12-18, Ned Simmons wrote:
On 18 Dec 2010 06:25:36 GMT, "DoN. Nichols" wrote: On 2010-12-16, Chris Wilson wrote: I need to make a fair number of 6 mm OD stainless steel pins to take 1 mm OD R clips. I want to drill the rods near one end with a 1.5 mm hole for the R clips. I have a Bridgeport universal mill I'm not familiar with R clips, FWIW. AKA hairpin clips. http://fasteners.hardwarestore.com/1...s--607526.aspx Aha! The holes are transverse not centered on axis. Forget my suggestions, then -- other than perhaps the speed suggestions. ... It really calls for a small lathe -- and likely something like a Taig or Sherline might get the speeds right. And I know that the Taig has a spindle available for WW series collets, which are commonly available in metric sizes in 0.1 mm steps. A lathe would be more appropriate for axial holes. The OP needs radial holes. Agreed. A nice small sensitive drill press would be a good choice here -- for example the ones made by Cameron Precision. (Except that they have gone way up in price since I got mine for $149.00 back around 1972 or so. And given that you are drilling into a curved surface you will probably want some kind of drill guide. A simple one, if you are holding the workpiece in a vise, is made by using a lathe to drill the same size hole through the center of some stock of the same diameter, part it off, put the workpiece horizontally in the vise, and lay the parted piece on top like a checker, tighten the vise, and drill through using the existing hole as a guide. You probably should put some shirt cardboard (cereal box cardboard, or something similar) between the moving jaw and the workpiece and "checker" to prevent slipping and to adjust to slight differences in diameter. (Replace it often as it gets crushed, of course.) A good drill bit for the task would be a high cobalt steel screw machine drill bit (shorter, thus less flex) with a split point (doesn't generate as much wandering force so it starts on center better, and it cuts to the center instead of mashing material out of the way like the standard chisel-point drill bits tend to do. Good Luck, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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