You can use cobalt drills, BUT you have to do it right... Low speed, (relatively) High feed and coolant/lubricant. You have to use a sharp drill and keep it cutting. If you don't lean on it enough it will burnish the cutting edge off and you bow have a blunt cobalt drill that is a bitch to sharpen because of the thick web.If you lean on it too hard.... PING. You have a broken drill. With the number of cobalt drills you are likely to go through it's probably cheaper to buy carbide if you plan to do this even on a slightly regular basis.I tend to use a carbide bit in my dremel and then finish the hole with a round diamond needle file.
Lately Ive been getting super cheap carbide bits from this place. They dont last as long but are about 1/4 the cost so overall they work good enough. I can get 30 holes from one bit if im careful.http://drillbitsunlimited.com/New-Drill-Bits-C291007.aspx?sid=25472Shipping to canada was cheap, might be worth checking what shipping to your country is.
Quote from: Syph007 on November 12, 2012, 11:39:47 PMLately Ive been getting super cheap carbide bits from this place. They dont last as long but are about 1/4 the cost so overall they work good enough. I can get 30 holes from one bit if im careful.http://drillbitsunlimited.com/New-Drill-Bits-C291007.aspx?sid=25472Shipping to canada was cheap, might be worth checking what shipping to your country is.Forgive me if I'm missing something at the drillbitsunlimited.com site, but the closest bit I see is .096"/2.45mm. That's about .0025" under the stated 2.5mm brass rod. If that size works, I'm all for it because those bits are relatively cheap. These are the ones I was looking at:http://www.use-enco.com/CGI/INPDFF?PMPAGE=44&PARTPG=INLMK32
the one i have is a dremel brand carbidelooks like this, it's not for drilling but you are grinding the sides(Image removed from quote.)
Quote from: WoodMan on November 12, 2012, 11:50:22 PMQuote from: Syph007 on November 12, 2012, 11:39:47 PMLately Ive been getting super cheap carbide bits from this place. They dont last as long but are about 1/4 the cost so overall they work good enough. I can get 30 holes from one bit if im careful.http://drillbitsunlimited.com/New-Drill-Bits-C291007.aspx?sid=25472Shipping to canada was cheap, might be worth checking what shipping to your country is.Forgive me if I'm missing something at the drillbitsunlimited.com site, but the closest bit I see is .096"/2.45mm. That's about .0025" under the stated 2.5mm brass rod. If that size works, I'm all for it because those bits are relatively cheap. These are the ones I was looking at:http://www.use-enco.com/CGI/INPDFF?PMPAGE=44&PARTPG=INLMK32I buy 0.125 size, but they do have 2.50 mmhttp://drillbitsunlimited.com/098-250mm-NEW-Solid-Carbide-Drill-Bit--P2388152.aspxThey arent the highest quality, but they work. I get more holes from a 14 dollar spade bit, but if I figure it out as cost per hole drilled I think these are slightly better. Much better if you only need to drill a few holes.
Quote from: Syph007 on November 12, 2012, 11:53:53 PMQuote from: WoodMan on November 12, 2012, 11:50:22 PMQuote from: Syph007 on November 12, 2012, 11:39:47 PMLately Ive been getting super cheap carbide bits from this place. They dont last as long but are about 1/4 the cost so overall they work good enough. I can get 30 holes from one bit if im careful.http://drillbitsunlimited.com/New-Drill-Bits-C291007.aspx?sid=25472Shipping to canada was cheap, might be worth checking what shipping to your country is.Forgive me if I'm missing something at the drillbitsunlimited.com site, but the closest bit I see is .096"/2.45mm. That's about .0025" under the stated 2.5mm brass rod. If that size works, I'm all for it because those bits are relatively cheap. These are the ones I was looking at:http://www.use-enco.com/CGI/INPDFF?PMPAGE=44&PARTPG=INLMK32I buy 0.125 size, but they do have 2.50 mmhttp://drillbitsunlimited.com/098-250mm-NEW-Solid-Carbide-Drill-Bit--P2388152.aspxThey arent the highest quality, but they work. I get more holes from a 14 dollar spade bit, but if I figure it out as cost per hole drilled I think these are slightly better. Much better if you only need to drill a few holes.Isn't .125" way too big? I would think a bit that much oversized would result in a lot of play in the tool.On a related note, what speed do you run the drill press at with the carbide bit?
i use 3/32 which is common here in the states. the pivots syph007 uses are larger then the pin stock.
he's using pivots instead of pins. it's not really anything to do with alox or cellidor, i may be wrong but i think one could use pivots for either EDIT provided you can drill out backside tools enough to use a pivot there
When you say low speed, what ballpark RPMs are you talking about. I was planning to use about 1200 rpm.And what type of carbide dremel bit. I'm guessing this is not a Dremel brand bit.
Those cheap bits are fine for a couple dozen holes at least. I find end mills to be pretty bad drill bits when used in a drill press, but they would be fine in a mill. A drill is a poor mans mill, and if you dont use a drill bit the hole wont self center. Might not be noticable, but in things that I do like drilling out scales and springs a milling bit would be bad, its important to have the hole exactly on center and a drill bit will do that on its own. Oh and cutting oil is a must.