Mill internal hex

[DCogswell]

Anyone Mill an internal hex (.250) on a Star SR20R using C axis on the sub?

I'm trying to figure out the code but, not having much success.

Any suggestions?

[ProProcess]

Milling interpolation or XC point-to-point?
What size radius can you have in the corners? i.e. what size endmill will you be using?

[DCogswell]

Originally Posted by ProProcess Milling interpolation or XC point-to-point? What size radius can you have in the corners? i.e. what size endmill will you be using?

.250 hole then use a 1/16 EM. I'm not sure what's easier or better, milling interpolation or point to point.

[SwissType1]

Depending on material and depth of cut, you may be able to rotary broach that form. It will save a ton of cycle time over milling pending the hex doesnt need to be clocked to other features on the part.

There's a good video here showing how fast it can be. YouTube - ‪Rotary Broaching Tools For Swiss Type CNC Lathes - Steel Broaching Demo -- GenSwiss‬‏

[DCogswell]

Originally Posted by SwissType1 Depending on material and depth of cut, you may be able to rotary broach that form. It will save a ton of cycle time over milling pending the hex doesnt need to be clocked to other features on the part. There's a good video here showing how fast it can be. YouTube - ‪Rotary Broaching Tools For Swiss Type CNC Lathes - Steel Broaching Demo -- GenSwiss‬‏

Yes, I'm aware of rotary broaching, I've done a lot of it for higher qty jobs. However, we see a lot of short run jobs and I would like to have the flexibility of machining this feature in various applications.

Thanks for the reply, hopefully I'll get this figured out and we'll share with the rest of the forum.

DC

[ProProcess]

Originally Posted by DCogswell .250 hole then use a 1/16 EM. I'm not sure what's easier or better, milling interpolation or point to point.

Milling interpolation would be easier to program if you have it available.

Originally Posted by DCogswell I'm trying to figure out the code but, not having much success

Are you having a specific problem?
Have you used milling interpolation for other features?

[hacdlux]

SOME TSUGAMI CODE FOR YOU(NOT VERIFIED)

(1/16 EM)
M105
M50
G28H0
G0 T3131
G17
M123
G0X.2165 Z.25
C120.
G97 S2500 M52
Z.1
G98 G1 Z-.125 F0.
X.1959 C106.858 F1221.74
X.1876 C91.957 F1413.99
X.1925 C76.91 F1440.16
X.2023 C67.963 F1329.
X.2165 C60. F1178.86
X.1959 C46.856 F1221.89
X.1876 C31.957 F1414.02
X.1926 C16.913 F1439.8
X.2024 C7.956 F1327.89
X.2165 C0. F1181.42
X.1959 C-13.141 F1221.6
X.1876 C-28.042 F1413.95
X.1924 C-43.093 F1440.51
X.2023 C-52.079 F1327.83
X.2165 C-60. F1177.64
X.1959 C-73.142 F1221.74
X.1876 C-88.043 F1413.99
X.1925 C-103.09 F1440.16
X.2023 C-112.037 F1329.
X.2165 C-120. F1178.86
X.1959 C-133.144 F1221.89
X.1876 C-148.043 F1414.02
X.1926 C-163.087 F1439.8
X.2024 C-172.044 F1327.89
X.2165 C-180. F1181.42
X.1959 C-193.141 F1221.6
X.1876 C-208.042 F1413.95
X.1924 C-223.093 F1440.51
X.2023 C-232.079 F1327.83
X.2165 C-240. F1177.64
G0 Z.25
G28 U0. V0. W0. H0.
M51
T0

LET ME KNOW IF YOU NEED A STEPOVER

COREY

[walkit]

hi... I am new in this forum. I would like to purchase a rotary broaching holder used, because I cannot afford a new holder, too much expensive..
can you help me if you have news of shops or people that sell?

[DCogswell]

Originally Posted by walkit hi... I am new in this forum. I would like to purchase a rotary broaching holder used, because I cannot afford a new holder, too much expensive.. can you help me if you have news of shops or people that sell?

If had one to sell, I probably still wouldn't sell it, they are worth their weight in gold.

The cost of a Rotary Broach holder is only expensive at the beginning, you'll be making money with it for years to come. I've never had to replace one.

[walkit]

Originally Posted by DCogswell If had one to sell, I probably still wouldn't sell it, they are worth their weight in gold. The cost of a Rotary Broach holder is only expensive at the beginning, you'll be making money with it for years to come. I've never had to replace one.

hi DCogswell, is right in fact it is not found, but it is possible to build it? do you have address web where to find a project diy detailed with picture? can you have guides project with step to step to build?
I hope for you can help, no they are found in web a lot of information on the rotary broaching..

[DCogswell]

Originally Posted by walkit hi DCogswell, is right in fact it is not found, but it is possible to build it? do you have address web where to find a project diy detailed with picture? can you have guides project with step to step to build? I hope for you can help, no they are found in web a lot of information on the rotary broaching..

I wouldn't attempt to build one unless I had a machine shop full of various equipment. And if I had all the necessary equipment then, there's a very good chance I could afford the cost of the holder.

With that said, I'm curious to find out what you've been quoted to get the holder. The holders for Swiss-type machines that I've purchased in the past have been in the $900USD range.

[hacdlux]

searching around because i remembered sseing cheaper holders in the back of production machining magazine

rental broach
Rotary Broach Tool Holder Rental

also hassey savage does an index broach only cuts two points at a time and you index in c 3 times

.250 broach is pushing it on a swiss i tried doing a .250 double hex broach in 300m and my machine was not happy with me. we ran 1 test part and pulled the job and put it in my mori