![]() The bottom of the hole may have partially formed crests with open “RABBIT EARS”. The straight hole method will result in a full, sharp-crested threads at the top of the hole. The Jarflo tap will ultimately produce the proper tapered thread by forming the material from the top to the bottom of the hole. Straight Hole – many applications for tapered pipe threads may use a straight hole.Tapered holes require the most torque and HP for tapping. Tapered hole may be drilled, reamed or cored. Tapered Hole – A pre-tapped tapered hole will result in a consistent percent of thread height the entire depth of thread in the piece part.There are two choices in the hole preparation for a Jarflo tapered pipe tap: It is not practical to thread form NPTF & NPSF threads because 100% thread is required, and the crests need to be fully formed. These benefits include improved thread finish, stronger threads, longer tap life, faster tapping speeds and no chips. I will post how it goes and maybe take some photos of the parts when I am finished if you guys are interested in seeing them.Jarflo roll form pipe taps (NPT & NPS) have significant advantages over cutting taps in many applications. Thanks to everyone for the kind knowledgeable advice here. If it works half as good as they are boasting I will probably buy these taps from now on as most of what I make is aluminum. Balax's website says that their taps can last 3-20 times longer on average than other taps. Altho what seems like a long time to me might be a days work for you guys running production parts all day long. From what I understand the roll form taps take LESS HP and actually last longer which is hard to believe since the spiral flute taps I currently use seem to last a long time in Aluminum. I HAD been using some spiral flute taps in aluminum and they work TONS better than the typical hand taps I used to use. I like the idea that you get a smoother better thread with the roll form. This is a really non- precision part but I am hoping it will be something the guys asking for it can sell a bunch of and I want to be able to offer it for a good price and be able to make them fast and accurate. Wish I had a large VMC but I am working on that. My machine is kinda small and has a 3hp three phase spindle. I will probably just use the coolant now since some of you remarked about it working well. This is my first Roll form tapping operation and I wanted info to help me get it right. As I said I am kinda new here and not really sure about this. ![]() Maybe we should spring for a new $10 tap before loosing a very-close-to-finished part.Ģ500RPm huh. We probably use an excessive amount filling a 0.600" deep hole to tap 10-24, but we have tapped hundreds of holes with one tap and no failures. ![]() Even Acetone and MEK has a hard time cleaning it off, well not really, but it never seems to want to come off easily. Oh, all this in 6061-T6.ĭown side of Moly-Dee is the mess, don't get me wrong, it works wonderfully and we use it on a T316 stainlees job with Balax form taps, it's just kind of a bear to clean off. We still have one hole in a job that is a blind hole and use a sprial fluter.what a pia to have to pull the chips off after every batch.at least it's only 4 holes per cycle. The holes are not very deep so even our Mazak horizontal barely gets to speed before reversing. I do not recall the tapping speed right off hand, but I'm thinking 2,500 rpm on 1/4-20's through M8's. Pete, are you running this on a machining center with coolant? We run our Balax Threadfloers (their tradename for thread foring taps) with a fairly low concentrate of coolant (~6% Qualichem semi-syn + water). ![]()
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