MechMate CNC Router Forum

Go Back   MechMate CNC Router Forum > General - MM Build
Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Reply
 
Thread Tools
  #1  
Old Sun 19 September 2010, 20:46
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
rolamite machine

Got the Joe's CNC 4 by 4 Hybrid running and it is a nice hobby machine but needs more beef. Great learning experience but not a MM. I am going to start on a MM 4 by 4 but instead of lead screw or R&P I am going to try rolamite. Not any machines of any type on the web that I can find that use the rolamite. Should be interesting. Since I have the router I winn make the Y plateform from 1/2" al plate. Apparently the DXF files are no longer on site so I guess that I will have to draw them from scratch which is a PITA!
Reply With Quote
  #2  
Old Mon 20 September 2010, 17:10
MetalHead
Just call me: Mike
 
Columbiana AL
United States of America
Art I sent you a PM - I have sets available for sale in my store.
Reply With Quote
  #3  
Old Mon 20 September 2010, 17:55
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
DFX files

I just wanted the DXF files because I need to make changes to original design. In rolamite version only 1 motor used on long axis though gantry is still driven/pulled from both sides. Also will use lead screw on Z.
Reply With Quote
  #4  
Old Mon 20 September 2010, 20:36
KenC
Just call me: Ken
 
Klang
Malaysia
This will be interesting! will keep my keen eye on this project!
Reply With Quote
  #5  
Old Tue 21 September 2010, 00:17
liaoh75
Just call me: David
 
Taibao
Taiwan
I'll Second that on Ken's statement! Looking forward to pictures!!!
Reply With Quote
  #6  
Old Tue 21 September 2010, 05:13
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
Rolamite

Here is an article on the rolamite published in 1968 by Popular Science. http://www.rexresearch.com/wilkes/1wilkes.htm#pm Other than a component of nuculear weapons trigger, air bag deceleration detection and a commercial postal scale i haven't found any uses. Reliability is EXTREMLY !! important is 2 of the uses. The big question is will it scale up!
First step is to build a 4by4 frame and and load the gantry with about 60 lbs of weigh and do a series of hundreds of rapids to see if slippage will be a problem. What wories me is that such a clean design is not in commom usage.
Weird that that bussiness has been in the crapper for the last 5 months while I have been going through cancer surgery/radation/cemo. Orders have matched my ability to spend time in shop so it hasn't been a bad thing. Build will take back seat to bussiness and learning Aspire so will probably be several months before tests can start.
First big step is to decide in band material. Metal would be nice but I don't know any thing about the stress/flex infolved. Anyone that has any experience in this area please share your knowledge. I would prefer 1/2" wide belt but 1" is not a problem.
Reply With Quote
  #7  
Old Tue 21 September 2010, 05:52
KenC
Just call me: Ken
 
Klang
Malaysia
No experience what so ever....BUT I'll participate base on what I read from the article.
I recon it requires a belt that doesn't stretch that much... Metal band would be a better bet.
Reply With Quote
  #8  
Old Fri 24 September 2010, 19:51
TheDave
Just call me: dave
 
Toledo (Ohio)
United States of America
I don't know if this will work, but...
http://www.fennerdrives.com/high_per...FQHW5wodxykb4g

I've replaced every single v-belt in my shop with this and I love it!
Reply With Quote
  #9  
Old Sun 26 September 2010, 08:14
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
band

I had one suggestion of .003" metal band from McMaster Carr. It has the strength but number of flex cycles before failure is unknown. As I see it there are 2 options. Using a flat belt of composite material that has almost no strech and probably 1" wide. Second is a metal band that will have to last several million cycles of flex. The load on the band will be 60 pounds at speeds up to 300 IPM. The strech factor is critical as the band on a 4' machine will be about 8' in length. My Shade Tree University degree in Southern Engineering says that metal would be the best way to go. If anyone knows of a vendor that migh have what I need please send me their contact info.
I am going to cut all metal parts from plate AL and bolt the assemblies togeather because with care the JoeCNC will mill the AL and I don't have capability to mill steel.
Reply With Quote
  #10  
Old Sun 26 September 2010, 20:57
KenC
Just call me: Ken
 
Klang
Malaysia
I would recon the strip need some spring quality too. and SS stretch a lot more then most ferros material.
I can think of band made out of shim sheet/strips. or those holding strips (still don't know what they are call correctly) use on good-old magnetized drafting table to hold the paper down.
Reply With Quote
  #11  
Old Mon 04 October 2010, 18:05
Art
Just call me: Art #2
 
Lancaster,Texas
United States of America
wire rope

How about wire rope? 1/8" has 1200 lb breaking strength and also it is used in plotters with 2 or 3 wraps around the powered shaft. Initialy Iwouls think that it would take 1000 or so high speed rapids to eleminate any internal slack and tighten the rope.
Reply With Quote
  #12  
Old Thu 07 October 2010, 10:28
TheDave
Just call me: dave
 
Toledo (Ohio)
United States of America
The article you linked to mentions what they use...

"But, I wondered, doesn't all that flexing of the band cause it to wear out eventually? Doesn't metal fatigue cause it to break? Those were questions that bothered Sandia engineers too, at the beginning. Now they've quit worrying. The beryllium copper bands used in Rolamite have proved to be so sturdy that they show no sign of metal fatigue after 1,000,000 flexures. At that rate, the engineers figure, the band in a Rolamited home light switch operated 10 times a day would last 300 years. A Rolamited bathroom scale used five times a day would not wear out in 600 years."
Reply With Quote
Reply

Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Thread Tools

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

BB 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
Machine operational cost Marinus Maintenance 24 Tue 19 October 2010 04:13
my machine cnc marcoscnc29 Archives 1 Sat 24 April 2010 17:58
Inexpensive machine controllers lumberjack_jeff 80. Computer Hardware & Software 6 Sat 13 February 2010 13:27
New Machine (well retrofit) podunk Construction started, but not cutting yet 2 Fri 08 June 2007 11:37
Wood carving machine Yuriy Kholodov Archives 5 Mon 12 March 2007 21:03


All times are GMT -6. The time now is 15:04.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.