Need help in Indy.

[tmaker]

I am the only one in my shop with prior exepireance. I need help. Some one to talk to.

[bps]

What kind of business are you working in?

[tmaker]

I am sorry I took so long to reply I have have been hunting. I work at American Fasteners in Avon, they have taken a lot of work over for Otis elevators. I am a good manual machinist. They bought a Haas vm3 and a saber cnc mill I read the books and learned g codes, is a lot different from manual machs. need help in feeds and speeds and someone that knows what they are talking about. At work when they see 2.1255 they say two point one two five five, I say two inches and one hundred twenty five and a have thousands and they have know idea what I am talking about.

[bps]

Sorry i can not help you on that. My background is manual machine and grinders. Used to be involved with plastics manufacturing as well.
JEB

[codyst]

2.1255 or 2 inches one hundred twenty-five and a half thousandths is the same thing when it comes down to the actual measurement. Some people just have a different way of communicating it.

The calculations for figuring your feeds and speeds are:
Revolutions per minute X Chipload (inches per tooth) X the number of flutes

If you're working with a tool vendor (Kennametal, Iscar, Valenite, etc.) they should have specs for recommended RPM and Chipload for their cutters, and should provide them if you ask.

So if you had a four flute endmill that you wanted to run at 500 rpm, with a chipload of .010

500X.010X4=20ipm

Those calculations are going to vary by, tooling material (Carbide, HSS, coated/uncoated), material being cut, surface finish required, etc.

I would start by getting the data sheets from your vendor with their recommended specs and adjust up or down accordingly from there.

[jjasshipley]

I have plenty of experience in cnc machining and programming. Been doing it for almost 20 years now. I specialize in exotic metals (titanium, cobalt, 400 series and duplex stainless, etc.) Where would you like to start?

[tmaker]

I don't know where to start so many questions, last post said call tool rep., how do I do that without stepping on anybodies toes? How do I tell our QC guy that you can't tell me that I am .005 over 75.375 with a tape measure, or tell my boss a post it note is not a work order? WE drill a lot of holes in 1018 cold rolled and hot rolled, we have a lot of insert drills that I have know idea where to start with the feeds and speeds. I was trained on man. Mach. buy an old timer and can make one dead nuts for you, but I do not know fast production. They have a Haas vf3 and a Cincinnati Saber cnc mill.I read the books and started programing.

[codyst]

If you have a PC at work, take a look at AutoEditNC. It has a decent machinist calculator built in for doing feeds/speeds, trig, etc.

I still think your best bet would be to get a copy of the data sheets. If you're worried about stepping on someone's toes, have whoever does the purchasing of tooling ask for them. Explain that having the supplier's specifications will speed up the programming process by having accurate data to set your feeds and speeds with. I doubt that anyone would be offended by trying to speed up processing.

You can PM me if you would like a copy of AutoEdit.

[tmaker]

Thank you codyst for AutoEditNC. I don't have a com. at work but I downloaded it at home and have been playing with it, wrote down some feeds and speeds to try tomorrow. I learned today why I should start numbering my lines I entered .33 instead of .35 on the 82nd hole, was hard to find to fix. Next question, when and why would I use g28?

[codyst]

G28 is used to return to reference position. I can't offer up a good explanation of when and why, because I never use it. When I do a home cycle, or return after a cutting block I always just use G90G53G00Z.

All I remember about G28 is that you had to switch to incremental at the end of your cutting block to retract Z. G91G28Z.... It's been so long since I had programming classes I can't remember the exact reasoning behind this either.

[jjasshipley]

I'm originally from Indiana, I used to work in Plainfield. I grew up in Winchester. I'll be headed back for a visit during spring break (when the kids get out of school), maybe I can stop by for a day, and see if I can get you pointed in the right direction on your programming. If your company doesn't allow this, send me a copy of a print, I'll write a program for it, and you can to. This will allow you to see where the difference is, and if you have questions as to the how or why, I can answer them. jjasshipley@satx.rr.com

[tmaker]

I am back on line, had to buy a new com. old one took a dump. jjasshpley I talked to my boss yesterday and he said you can stop by and help me, but he can't pay you. Up to you but I don't want to take away from your vacation. Don't know how to send prints yet, I have Autodesk inventor 5, but I don't know what I am doing yet. If you send me a print we can do it that way. celisasmith@sbcglobal.net Celisa is my wife I am Tony.