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  1. scottmaha

    Tapping titanium

    We do machining of 6Al4V titanium and use EM-TI taps from Greenfield. Tapping titanium presents some unique problems compared to other materials. It has a tendency to spring back because of its extreme elastic memory. I believe the EM-TI taps have extra back taper and radial clearance to help...
  2. scottmaha

    Ultimax comment character?

    Try the asterisk (*). I have seen this work on other non-fanuc controls.
  3. scottmaha

    Drill bit question

    Taking in to account that you have a rigid setup, coolant throught the spindle, and an accurate tool holder (ER collet or hydraulic chuck), then I would go with the "G" drill. This is a double margin straight flute drill that is designed for drilling and reaming in one pass. I would not look to...
  4. scottmaha

    303S vs 304L

    The 303S is considered a "free machining" stainless. It has a machinability factor that is better than 304L or 316L. However, you will sacrifice corrosion resistance with this material. I recommend going with the 316L. You can spend a little extra on the material and buy from Carpenter. Their...
  5. scottmaha

    17-4 stainless

    Hi punches, I have had success in drilling 17-4 with the following drill from Guhring: Series #329 Guhring has a .3858"(letter "W") in their book. It has 1.7" of flute length which will be fine for your hole depth. Start out at 450 rpm with a feed of 2.3 ipm. Do not use the pecking cycle as...
  6. scottmaha

    DRILLING E8740 STEEL

    Hi Punches, I have some experience with machining 8000 series alloy steel. I have found that Guhring makes a nice carbide drill for drilling this material. They have a coating called Firex that has a very high tolerance for heat. If you are able to introduce coolant through the tool on your CNC...
  7. scottmaha

    drilling feed and speed

    Hi Nitro, Go with the following drill: If it is 3xD go with Guhring series #5510 If it is 5xD go with Guhring series #5511 The drills have Guhring's Firex coating which kicks but in these types of steels. Since you are drilling in to a convex surface you will want to reduce the feed rate by...
  8. scottmaha

    Drilling Monel 400

    Yeah, Titex is a little cheaper but the quality difference between Guhring and Titex is drastic. I work for GE and we do a lot of drilling in my area and we have tested both. We tried Titex because it was a bit less in price. The Titex folks told me to run it at the same feeds and speeds as the...
  9. scottmaha

    Need advice on drilling holes in Aluminum

    we drill aluminum all the time. we machine 2024, 6061, and 7075 - all T-6. we use guhring drills exclusively. we have tried everyone else, but guhring has proven to be the best. for your application, i would recommend guhring's series #552 drill. this is guhring's GT80 parabolic flute drill. we...
  10. scottmaha

    general consensus drilling question

    this question is to be directed towards the machining population. when it comes to drilling and holemaking in general, which company or companies stand out? thanks
  11. scottmaha

    How to measure wear resistance of sintered carbides for cutting tools

    i really do not understand why you have to make something so simple so difficult. with todays carbide and coating technology, selecting the right insert for the job has become easy. we machine several different types of material (inconel 625, 4140, 4340, hasteloy-x, 6061 aluminum, 1045...
  12. scottmaha

    weld spatter prevention

    thanks for the help guys.
  13. scottmaha

    weld spatter prevention

    yes mike, i want t use plugs. as you mentioned, the b.c.d is to close to the 40mm hole. what material would be best to make the plugs with? brass, copper.........?
  14. scottmaha

    weld spatter prevention

    i have an application on my welding robot where weld spatter has been a bit of a problem. we have two pieces that are welded together. we have a 12mm thick plate with a 40mm hole in it. this plate has four drilled and counterbored holes on 65mm bolt circle. we put a 40mm shaft inside the 40mm...
  15. scottmaha

    M10x1.5 thread tapping

    there may be some more variables at play here. are you actually measuring the hole after drilling to see if the drills are drilling the hole to the specified size? if not, you may want to check this. are you drilling the hole using an alignment bushing? are you spot drilling the hole prior to...
  16. scottmaha

    cutting inconel and austenitic stainless

    i have had loats of experience cutting these materials. however, i have always used synthetic coolants. i have heard that sulfer based coolants work well for these materials. could someone please confirm this? if so, please explain why the sulfer based coolant works best. thanks a lot
  17. scottmaha

    drilling grade 8.8 metric bolt

    corypad is correct about the bolts hardness. the grade 8.8 metric bolt has a tensile strength of 120,000 psi. i have used a drill from guhring already. however, i think the design of the drill did not lend itself well to my particular application. it is guhring's GT100 deep hole drill. the...
  18. scottmaha

    drilling grade 8.8 metric bolt

    i need to drill a 3.2mm hole through a grade 8.8 metric bolt. the bolt is M8 x 55mm long. the bolt is a production part. i have 1200 psi coolant pressure through the spindle. i would like to drill the bolt from one side all the way through. this has proven difficult. the only thing that is kinda...
  19. scottmaha

    fastener proof load?

    could someone explain proof loading of fasteners to me? thanks
  20. scottmaha

    Which machines are the best?

    wow! what a lucky guy. there is nothing better than spending other peoples money - especially when comes to capital equipment. you mentioned that you have hardinge and DMG. these are both good machines. the CHNC machines from hardinge are known to be workhorses and do well within the production...

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