Hole Making

[dlane]

Try this here, looking for advice , suggestions for buying screw machine drill bits, without being disappointed
Any one brag about there short drills, if so what brand , coating, material , at a reasonable price
I'm thinking a # set 135 deg ,cobalt, for threaded holes mostly for mill work, can't afford all denominations, but would like a good set. I have jobber sets and try to use all of them , pilot holes / slop fits
Looked on eBay, Amazon, Enco there are bunches of manufacturers ,material ,coatings , which is best ?.
Thanks
No drama

 

[Ozwelder]

I am an Aussie ,if you haven't guessed it from my screen name and avatar and own an Alpha brand ,set of metric drills. These drill are made in Europe 135 split point 1 -13mm ,titanium coated housed in a tough plastic case which did not destruct after the first bang or being dropped off the bench.
I have owned them for a couple of years and find them better value than some of the big name rebadge stuff I have encountered before buying these drills.I paid around $100 Australian. I am not sure what you mean by screw machine drill bits but post this anyway, for what it is worth, it might help someone. I don't have the cobalt, only HSS but understand the same company produces a cobalt set.

 

[Wreck™Wreck]

For general use I like PTD Precision Twist Drill, 135 Deg. split, black oxide above 1/16". If you have to drill hundreds or thousands of holes as quickly as possible there are alternative products for every application. Using the various coating technologies may be helpful, be aware however that many coatings are only advantageous under ideal cutting conditions, putting a TiN coated HSS drill in a hand fed drill press or mill will most likely gain you nothing but added expense and shiny gold colored drills (-:

 

[mikey]

I use and like Precision Twist Drill sets, too. I have the bright finished 115 piece, 118 degree bit set. These drills cut fast and more accurately than the jobber drills and save a lot of travel in Z. I also own some screw machine drills with 135 degree split points and on the mill, do not believe they make a major difference. With a hand held drill, I prefer them as they walk a bit less but either will work in a mill or drill press.

Got my 115 piece set off ebay as a "used" set for $100.00. When I got it I checked every single drill and none were used, just the case was dirty and that cleaned up nice, too. Some guys just don't know what they have.

 

[dlane]

Pulled the trigger on 1/16-1/2" by 64th ,cobalt ,bright gold,135 deg ,screw machine set made by PTD.Ordered from Enco ( they got to quit sending me those promo discount codes ) Hope there good ones , all I could find on eBay was new ones , wrong search words I guess.
Dose the rag trick work with drills to just curious, I'll keep that one for tapping
Thanks for the advice / recommendations

 

[RJSakowski]

I am not sure what you mean by screw machine drill bits

Screw machine drills are shorter than jobber length. Because of the shorter length, they are less likely to wander or to have runout so they can be used directly without the need of first using a center drill in most instances.

 

[catskinner]

Pulled the trigger on 1/16-1/2" by 64th ,cobalt ,bright gold,135 deg ,screw machine set made by PTD.Ordered from Enco ( they got to quit sending me those promo discount codes ) Hope there good ones , all I could find on eBay was new ones , wrong search words I guess.
Dose the rag trick work with drills to just curious, I'll keep that one for tapping
Thanks for the advice / recommendations

What rag trick I couldn't find the original comment.

Thanks
Jim

 

[Bill Gruby]

The rag trick is for tapping holes. If you tap a hole and it is tight just throw a rag over the hole and tap again, The rag will not only clean the tapped hole it will also make it slightly larger and a better fit. It is not a trick nor a myth, it is old school fact. It does work.

"Billy G"

 

[Andre]

The rag trick is for tapping holes. If you tap a hole and it is tight just throw a rag over the hole and tap again, The rag will not only clean the tapped hole it will also make it slightly larger and a better fit.

"Billy G"

Similar to the paper trick when used to thread soft plastics?

 

[John Hasler]

The rag trick is for tapping holes. If you tap a hole and it is tight just throw a rag over the hole and tap again, The rag will not only clean the tapped hole it will also make it slightly larger and a better fit. It is not a trick nor a myth, it is old school fact. It does work.

"Billy G"

I wish I'd known that a couple of days ago...