Update- I couldn't find any Harvey threadmills in stock yesterday, but I found some Micro-100, pretty much all the same dimensions. I seem to be getting a bit of deflection, but other than that they seem to be cutting good, and they are still in one piece. I did as MKD suggested and I'm using a rougher and a finisher. Good point about checking them on a comarator first, these two were identical, but that woulda been a real ball buster if they hadn't been. I also have some 10-32sti holes, drilled thru and threaded about 1/2 deep. Didn't have any problem with those until I snapped a tap off. I was only tapping them about .35 deep and then chasing by hand. I'm going to try peck tapping these. I'm waiting to get a scrap casting back to try it on.

Thanks for the suggestions. I opened up the minors to .094, which is right on the high. Made no difference in trying to hand tap them. I'll see if I can find a Harvey TM tomorrow and try that.

I had ordered Guhring RT100HF drills, they are not here (I don't want to get into a carbide salesman bashing rant) I'm using OSG VPN drills with great success. Going larger on the minor seems like a good idea, I'm going to try and ream out one and see. As far as threadmilling, the single point mills I've seen don't look too strong. At $120 or so ea., well be running this job for free pretty soon.

I've never tried roll tapping Inconel, but these are also UNJ-3B threads. It's sometimes hard to control the minor dia with form taps

I'm currently running a job, Cast 718, heat treated. I have some 4-40 blind holes to thread. My first plan was to thread mill them. The thread depth is .225 min and a standard 4-40 threadmill is .175 long. They have longer ones, but the shanks are relieved back, they look so weak it's hard to picture them not breaking. Same thing with grinding back a standard threadmill. Whenever I try grinding one back it's weakens it too much, So, I thought I'd threadmill to .175 and chase to depth. I'm finding it difficult to chase such a small hole in such hard material without snapping the tap off. To add to the problem, my threadmill broke after 5 parts. So here I am on a Sunday morning, and I just finished drilling out all the broken taps. Now I/m looking for a new approach. I thought maybe peck tapping would be the answer. Anybody used it with success? BTW, I'm using both Emuge and Exo-VC-10 taps with Moly-Dee

I like to use double angle cutters, you can deburr both sides with one tool. I draw it as a custom tool

Can you just post a section of your code?

So, later today I need to mill some 4-40's in Inconel. Should I use a neg taper to avoid having the holes get tight at the bottom?

We do quite a bit of work for Parker. When I quote a job that I don't have a port spec for, they flat out refuse to provide it. They say I need to buy it from SAE. The SAE specs are legit, no problem with them at all, except they'll wring you for $70 for 2 pages. And like I said, spam city. In fact, I just got some spam from them this afternoon.

What you will purchase is the actual SAE spec, for this port in particular it will have a general drawing, and then a table for all the different dash numbers. They are all tolerance as well. Only problem I've had going through SAE is that once you order a spec from them, they will fill your mailbox with Spam until the end of time.

It also amazes me how many inspectors are clueless as to how to factor in MMC. With a TP of 0, it's kind of hard to hit without it. Throw a LMC at them and really confuse them

It's amazing how many QC guys don't understand the concept of flatness. My biggest gripe is when you have a part with a .0005 tru position, they throw it up on a CMM with .0001 resolution, and proclaim, "It's scrap, CMM says it's off"

I don't want to name names, but An aerospace company that used to be based out of Burbank. I think they are still around.

+1000

I don't see it anymore, but many many years ago I worked in a huge shop where they had a department for everything. Most of the people in the programming department were right out of Jr College and had never even walked through a shop before. Most of the first run programs were downright dangerous. All were comical, at best. MY favorite was always trying to plunge straight into a pocket in Z with an 8" face mill.

You could always just do it with 2 ops.

Yes. Look at it this way. Say you have a tapered threadmill, and the bottom tooth has a diameter of .200 (I'm just using BS values here for the point of illustration) Say the next tooth up from the bottom has a diameter of .250. If your toolpath just makes a helix up one turn, your bottom tooth is going to be .025 away from where the "next to bottom tooth" left off. So the toolpath needs to spiral outward as it goes up. This is controlled by the taper angle. I'm curious what your threads looked like without the taper angle In the toolpath. The threads would still have a taper, from the taper in the tool, but it seems there would be a discontinuity in the thread.

Man, I got major problems. Even though we are AS9100 (came out of a cracker jack box, I think) our document control on our network drive is a joke. As far as MC files and part programs, they hire people who come in and work off their personal laptops, then they get fired or quit, or both, and leave and we have no copies of their files. Anyway, not to ramble on too far, Last year I bought a 3TB Usb hard drive and started reorganizing everything we had on it. I had all our files organized by P/N, tool libraries, holders, Vericut files, form tools.ect. Everything was right there for instant access. About 3 mo ago went to click on a file and I get an error saying the drive no longer exists. Make a long story short, the drive I moved everything to is DEAD. (Thank you Western Digital) So I need to start over and create a new drive, but all these files are scattered all over creation. But this time I'll make a 2nd backup. So, what I'm trying to say is that I haven't found my -8 porting tool yet. Sorry

Can you wait till tomorrow? I could only find -4, -5, and -6. I know I have back ups at home, I'll look tonight.

Yes I do, however that HDD I have everything backed up to died. Let me see if I can find a copy.

In the view manager, you can display the matrix, but this is hardly simpler

Who from? I'm seeing pricing around $500

What model rotary are you using?

Thanks for all the replies and suggestions. We are going to try the Hangsterfers S737. Keeping my fingers crossed.

Are you in G93 or G94? Inverse time is the amount of time it takes to complete the move. F150. is way faster than F999.99 If you were trying to machine at 999.99 IPM, a gouge might be expected.