Go to Post It's a game feature, they're helping us, please don't complain too loudly.... - MrForbes [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 29-02-2004, 21:07
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,518
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
How hard is it to CNC this?

I was wondering how hard it would be to CNC this. Would I make it to size on the manual lathe first and then have the CNC mill do all the rest? Just to give an idea of the size, the OD is about 2.5 inches and the part is about 1 inch deep. I have a guy who will make the program in MasterCAM and I will set up the machine. I know this can be done (as I have seen way more complex stuff than this) but I don't know how hard it would be. The space between the six protrusions is .134 which is pretty small. Is a 1/8" end mill that is at least 1 inch long a common thing? Thanks.

EDIT: Forgot attatchment, added now.
Attached Thumbnails
Click image for larger version

Name:	hub2.jpg
Views:	182
Size:	41.0 KB
ID:	1919  
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004

Last edited by sanddrag : 29-02-2004 at 21:14.
  #2   Spotlight this post!  
Unread 29-02-2004, 21:11
dez250 dez250 is offline
54... What a good number!
no team
 
Join Date: Dec 2002
Rookie Year: 2000
Location: Upstate NY / Manchester, NH
Posts: 1,721
dez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond repute
Send a message via AIM to dez250
Re: How hard is it to CNC this?

Quote:
Originally Posted by sanddrag
I was wondering how hard it would be to CNC this. Would I make it to size on the manual lathe first and then have the CNC mill do all the rest? Just to give an idea of the size, the OD is about 2.5 inches and the part is about 1 inch deep. I have a guy who will make the program in MasterCAM and I will set up the machine. I know this can be done (as I have seen way more complex stuff than this) but I don't know how hard it would be. The space between the six protrusions is .134 which is pretty small. Is a 1/8" end mill that is at least 1 inch long a common thing? Thanks.
Sorry but due to the innovations that FIRSTers can come up with i think i have an image in my head of this. But do you have a screrenshot from inventor or a sketch of this item. A photo would help give me give you a clue on the trickiness it will take to machine on a CNC.
__________________
#5

-Michael Dessingue

Last edited by dez250 : 29-02-2004 at 21:19.
  #3   Spotlight this post!  
Unread 29-02-2004, 21:23
ahecht's Avatar
ahecht ahecht is offline
'Luzer'
AKA: Zan
no team
Team Role: Alumni
 
Join Date: Dec 2001
Rookie Year: 2002
Location: Billerica, MA
Posts: 978
ahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond reputeahecht has a reputation beyond repute
Send a message via ICQ to ahecht Send a message via AIM to ahecht Send a message via Yahoo to ahecht
Re: How hard is it to CNC this?

Other than the keyway, it should be fairly easy to CNC. The keyway would be phisically impossible to mill (unless you have a 90 degree end mill, which may not even exist), and would need to be broached.
__________________
Zan Hecht

Scorekeeper: '05 Championship DaVinci Field/'10 WPI Regional
Co-Founder: WPI-EBOT Educational Robotics Program
Alumnus: WPI/Mass Academy Team #190
Alumnus (and founder): Oakwood Robotics Team #992


"Life is an odd numbered problem the answer isn't in the back of the book." — Anonymous WPI Student
  #4   Spotlight this post!  
Unread 29-02-2004, 21:27
dez250 dez250 is offline
54... What a good number!
no team
 
Join Date: Dec 2002
Rookie Year: 2000
Location: Upstate NY / Manchester, NH
Posts: 1,721
dez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond repute
Send a message via AIM to dez250
Re: How hard is it to CNC this?

Quote:
Originally Posted by ahecht
Other than the keyway, it should be fairly easy to CNC. The keyway would be phisically impossible to mill (unless you have a 90 degree end mill, which may not even exist), and would need to be broached.
Also the spaces between the 6 stading posts can not be milled due to you wanting them to be square. If you dont mind that space being a circular gap, it could be done. Though if it needs to be a square gap, it would have to be cut out with a saw most likely.

Edit: ok you can mill the spaces and get a circular gap then grind/sand/file it to square but i doubt it would look or act as if you did it with a saw if you want it to be square.
__________________
#5

-Michael Dessingue

Last edited by dez250 : 29-02-2004 at 21:46.
  #5   Spotlight this post!  
Unread 29-02-2004, 21:27
jacob_dilles's Avatar
jacob_dilles jacob_dilles is offline
Registered User
AKA: theshadow
FRC #0620 (WarBots)
Team Role: Mentor
 
Join Date: Jan 2003
Rookie Year: 2003
Location: Vienna, VA
Posts: 245
jacob_dilles will become famous soon enough
Send a message via AIM to jacob_dilles
Re: How hard is it to CNC this?

Quote:
Originally Posted by ahecht
Other than the keyway, it should be fairly easy to CNC. The keyway would be phisically impossible to mill (unless you have a 90 degree end mill, which may not even exist), and would need to be broached.
that is true, but you could mill it rounded and take a little time filling it out. it wouldent be TOO bad
__________________
--------------------------
"You're not a real programmer until all your sentences end with semicolons;"
  #6   Spotlight this post!  
Unread 29-02-2004, 21:30
dez250 dez250 is offline
54... What a good number!
no team
 
Join Date: Dec 2002
Rookie Year: 2000
Location: Upstate NY / Manchester, NH
Posts: 1,721
dez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond reputedez250 has a reputation beyond repute
Send a message via AIM to dez250
Re: How hard is it to CNC this?

Quote:
Originally Posted by jacob_dilles
that is true, but you could mill it rounded and take a little time filling it out. it wouldent be TOO bad
When doing a keyway, you want to properly broach the keyway. That is so you have the correct tolerances and the key does not slide out of position or move at all.
__________________
#5

-Michael Dessingue
  #7   Spotlight this post!  
Unread 29-02-2004, 21:31
jacob_dilles's Avatar
jacob_dilles jacob_dilles is offline
Registered User
AKA: theshadow
FRC #0620 (WarBots)
Team Role: Mentor
 
Join Date: Jan 2003
Rookie Year: 2003
Location: Vienna, VA
Posts: 245
jacob_dilles will become famous soon enough
Send a message via AIM to jacob_dilles
Re: How hard is it to CNC this?

lol thats why i do programing and nothing else
because i dont know these things...
__________________
--------------------------
"You're not a real programmer until all your sentences end with semicolons;"
  #8   Spotlight this post!  
Unread 29-02-2004, 21:32
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,518
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
Re: How hard is it to CNC this?

The keyway is easy to broach. I can do that no problem.
Quote:
Originally Posted by dez250
Also the spaces between the 6 stading posts can not be milled due to you wanting them to be square. If you dont mind that space being a circular gap, it could be done. Though if it needs to be a square gap, it would have to be cut out with a saw most likely.
Could you explan this a little more? I'm having a bit difficult time understanding what you mean by "circular gap" Perhaps a quick sketch? How is everyone envisioning this being held in the machine (what orientation?) I picture the axes of the holes parallel to the z axis of the machine.
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
  #9   Spotlight this post!  
Unread 29-02-2004, 21:33
Greg Needel's Avatar Unsung FIRST Hero
Greg Needel Greg Needel is offline
REVving up for a new season
FRC #2848 (All-sparks)
Team Role: Engineer
 
Join Date: Jan 2002
Rookie Year: 2002
Location: Dallas, TX
Posts: 3,110
Greg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond repute
Re: How hard is it to CNC this?

Quote:
Originally Posted by dez250
Also the spaces between the 6 stading posts can not be milled due to you wanting them to be square. If you dont mind that space being a circular gap, it could be done. Though if it needs to be a square gap, it would have to be cut out with a saw most likely.



this is incorrect....if you have the clearance past the spaceing going past it with a standered cutting mill bit will leave a square notch...the side profile on a round mill while spinning is a rectangle
  #10   Spotlight this post!  
Unread 29-02-2004, 21:36
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,518
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
Re: How hard is it to CNC this?

Quote:
Originally Posted by Greg Needel
this is incorrect....if you have the clearance past the spaceing going past it with a standered cutting mill bit will leave a square notch...the side profile on a round mill while spinning is a rectangle
That's what I was thinking. Perhaps dez was envisioning this thing in a rotary chuck 4th axis which would index that part for each slot and then when it gets to the end of the slot where the big diameter portion of this part is it would be rounded in the end of the slot.
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
  #11   Spotlight this post!  
Unread 29-02-2004, 21:40
Greg Needel's Avatar Unsung FIRST Hero
Greg Needel Greg Needel is offline
REVving up for a new season
FRC #2848 (All-sparks)
Team Role: Engineer
 
Join Date: Jan 2002
Rookie Year: 2002
Location: Dallas, TX
Posts: 3,110
Greg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond reputeGreg Needel has a reputation beyond repute
Re: How hard is it to CNC this?

Quote:
Originally Posted by sanddrag
That's what I was thinking. Perhaps dez was envisioning this thing in a rotary chuck 4th axis which would index that part for each slot and then when it gets to the end of the slot where the big diameter portion of this part is it would be rounded in the end of the slot.


maybe...i am just glad you agree i was going insane trying to figure out what he was talking about....


btw for someone who is good with a cnc mill this souldn't be that bad of a part
  #12   Spotlight this post!  
Unread 29-02-2004, 21:43
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,518
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
Re: How hard is it to CNC this?

Would I face it to length, step down the diameter, and bore the (5/8 di) hole on a manual lathe first?
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
  #13   Spotlight this post!  
Unread 29-02-2004, 21:51
Rob Colatutto's Avatar
Rob Colatutto Rob Colatutto is offline
Roboticsrob
FTC #10092 (Green.Griffins;)
Team Role: Mentor
 
Join Date: Feb 2002
Rookie Year: 2001
Location: San Diego, CA
Posts: 849
Rob Colatutto is a splendid one to beholdRob Colatutto is a splendid one to beholdRob Colatutto is a splendid one to beholdRob Colatutto is a splendid one to beholdRob Colatutto is a splendid one to beholdRob Colatutto is a splendid one to beholdRob Colatutto is a splendid one to behold
Re: How hard is it to CNC this?

Facing the part on a lathe and taking down the outside diameter will make the time on the cnc mill much less than if you just put a square block of aluminum on. However, if you are using a square block you don't need to drill any center hole in the part, the cnc can do that all for you. If you plan on taking the part down on the lathe then I would reccomend having a center hole of some size larger than 1/2 inch so your machinist can easily use a dial indicator and find the center of the part to make set up much simpler. Having the cnc mill do the center hole to exact dia. will be better than doing it on the lathe if you planned on using a drill bit, if you are using a boring bar then you will be fine making it exact, provided your lathe is true. And yes, make sure you take the keyway out of the drawing before you put it into mastercam, it does not like things like that, and it will try to cut it out if you leave it in there.

[edit] to nicely go from Inventor to Mastercam you will need to save it as a .step file, and then you can import that into Mastercam. If you have Mechanical Desktop installed, I would open to .step into there and save it as a .dwg because Mastercam seems to like them slightly more.
__________________
Follow me on twitter @roboticsrob and my FTC team @griffins10092

Last edited by Rob Colatutto : 29-02-2004 at 21:55.
  #14   Spotlight this post!  
Unread 29-02-2004, 23:39
Random Dude Random Dude is offline
Oregon State Head FTA
AKA: Chris
no team (Oregon Robotics Tournament & Outreach Program)
 
Join Date: Aug 2002
Rookie Year: 1998
Location: Oregon
Posts: 142
Random Dude will become famous soon enoughRandom Dude will become famous soon enough
Re: How hard is it to CNC this?

Quote:
Originally Posted by sanddrag
I was wondering how hard it would be to CNC this. Would I make it to size on the manual lathe first and then have the CNC mill do all the rest? Just to give an idea of the size, the OD is about 2.5 inches and the part is about 1 inch deep. I have a guy who will make the program in MasterCAM and I will set up the machine. I know this can be done (as I have seen way more complex stuff than this) but I don't know how hard it would be. The space between the six protrusions is .134 which is pretty small. Is a 1/8" end mill that is at least 1 inch long a common thing? Thanks.

EDIT: Forgot attatchment, added now.

Hmm.. this looks an awful lot like the hubs for the skyway wheels, just with a hub & keyway attached...

If thats what there intended purpose is, why not just machine a plate to mount to the existing hubs?
  #15   Spotlight this post!  
Unread 01-03-2004, 00:49
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,518
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
Re: How hard is it to CNC this?

Quote:
Originally Posted by Random Dude
Hmm.. this looks an awful lot like the hubs for the skyway wheels, just with a hub & keyway attached...

If thats what there intended purpose is, why not just machine a plate to mount to the existing hubs?
It is very similar to the skyway wheels but it is actually for different wheels for a different project. They are just a plain bore through plastic, no pre-existing keyway. That's what these hubs are for. I had thought about a plate that clamps the wheel (http://chiefdelphi.com/forums/showthread.php?t=26215) but have determined that since I have the resources to do a full-blown CNCed hub, I will go with that. It is kind of dificult to explain but the center section of my wheel connecting the spokes to the hub is is very thin width, only .125 at the most. Putting just bolts through that thin of plastic will not be enough to drive the wheel reliably, so the two sides of the hub would have to clamp together to drive the wheel and I'm not so sure of that because in its application, it really cannot afford to slip no matter what. This design I have shown in this thread will fully engage the wheel and fills in all the voids in the hub area which makes it very strong. Basically with this, the plastic cannot flex anywhere because it would be running into aluminum, which is contacting the next section of plastic, and so on.

EDIT: I attatched a picture of the wheel's hub area. These void spaces are present on both sides of the wheel. One of these hubs will go on each side. The "thin plastic area" I talked about above is in these cutouts or void areas in the wheel. These cutouts have a bottom to them, and so do the ones on the other side. See, the whole wheel hub is about 2 inches thick and the cutouts are .95 deep on each side. That's why I want to fill up those spaces with the aluminum hub.
Attached Thumbnails
Click image for larger version

Name:	IMG_0046.jpg
Views:	54
Size:	40.8 KB
ID:	1921  
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004

Last edited by sanddrag : 01-03-2004 at 01:03.
Closed Thread


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Why was stacking so hard? Tton General Forum 39 16-03-2003 19:17
Potential Hard Drive on RC? Goya Programming 10 09-01-2003 13:55
Super Hard TV/Movie Test Aaron Lussier Chit-Chat 8 13-12-2002 06:40
Are you hard core or not? Joe Johnson Championship Event 7 25-04-2002 23:05
How hard is it to pull a goal? Ken Leung General Forum 19 17-01-2002 20:09


All times are GMT -5. The time now is 14:21.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi