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Metal work ,drilling, best bit, and welding question

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ERIC

03-02-2003 15:57:00




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ruined a few bits this weekend. two 3/4 and two 5/8. ouch that hurts the tool fund! but once you start gotta finish the job. i think i need a floor press that goes slower. i have a big table drill press (its an antique delta) anyone have any experience with changing pullies? where could i find them? and a new belt?

next question i bought a few bits from "drill bit city" ant the farm science review in ohio. kinda a traveling drill bit show and sales. good bits. salesman told me never do a pilot hole, ruins next bit through hole? any thoughts? what is the best bit out there for the home shop?

next question when welding downhill at say a 45 degree slope. i start at the top and work down right? (arc, 6013, mild steel) as always thanks for your time! eric

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Bill Oakes NY

03-03-2003 09:28:04




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
Hi Eric,

I posted, about a week ago, about the success I had with my new Grizzly drill press. It will run at 140 rmp, 3/4 hp. It is great for drilling larger holes. I don't believe it is good to drill larger holes with increasingly larger bits. I might drill a shallow, small diameter hole to be sure the big bit centers where I want it. Tha Grizzly was only $179; I kept my old unit for small holes.

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Taylor Lambert

03-03-2003 08:49:51




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
Can you not regrind the drills. Ive had to cut som off halfway then regrind them. I had the same trouble with my drill press the slowest it would run was 300 rpm so i found an old Gearmotor off a conveyor and made a nice drill for 1 inche holes. In machinist school they teach you to only drill the pilot hole big enough to get the point of the drill through because its the most inefficient cutting part of the drill. for a 1 inch drill ill drill a 1/8 hole. If you drill a 13/16 hole then run a 1 inch drill through ti the flutes want pull the drill throu the work or chip the flutes. In school and various jobs ive drilled hoes big as 3 inches before. and the same principles applty there un less you have som 3 fluted coring drills they dont have a point just a flat nose thats tapered. the extra flutes distribute equal pressure on the flutes and theres is les chance of it climbing.

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john

03-03-2003 07:25:05




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
Try acetoolrepair.com for any drill press parts.



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kraig WY

03-02-2003 19:59:57




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
Check out "Machinery's Handbook" it will answer all the questions you just asked and a lot more. If you do any metal work you'll use it for a referance a lot.



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Central Minnesota

03-02-2003 19:18:10




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
With 6013 run uphill for strength downhill for beauty. If downhill stay ahead of the puddle. Try a good grade of cutting fluid for your drilling problem. If you use a pilot it should be only slightly larger than the web of your larger drill bit. Maybe 1/16" larger



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Farmered

03-02-2003 18:39:16




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
Eric, A good machineist guide book will have tables of speeds to operate different size drills in different materials. It pretty well translates to cutting speeds in feet per minute.
Larger drills travel more feet per minute at the same RPM.
I had a floor model Delta drill with variable speed pullys that wouldn't run under 1200 RPM.
I put a 4 to 1 jack shaft on it and got it down to a realistic speed that wouldn't turn bits blue.
I was told, for the life of my bits I should never redrill any size hole with a larger drill.
You should use a reamer. A reamer will give you a cleaner more accurate hole anyway. Comes down to
do you want to buy bits or reamers. Ed

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SHeiserman

03-02-2003 18:36:34




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 Re: metal work ,drilling, best bit, and welding question in reply to ERIC, 03-02-2003 15:57:00  
Never tried to work on a drill press, so I can't help you there. If I'm using a drill press I don't start with pilot hole. If I'm using a regular drill, I always use pilot hole for 1/2" holes on up. It's easier on me, the drill, and the bits. You can weld downhill as long as you're hot enough and keep the slag in front of the puddle. If you're going uphill at a 45 degree angle, several small beads opposed to 1 pass works well. Good luck.

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