Drill Modeling

[Zaki]

< = defer>


Hi All


I am again with a new but extremely simple challange. make this drill in just 5 minutes.

View attachment 2007

 

[Miko]

Hi Zaki .. It was very simple..

View attachment 2008

 

[Miko]

And this is similar product >2006-03-18_115634_Warping_thorn-Miko.zip


the Warping thorn which is using for spiralcutting by warping technology in the arms industry (gun-barrel).

 

[CPiotrowski]

cant see it, none of the images are showing for me.

 

[Miko]

Hi CP .. The problem is that the server of mcadcentral.com was hacked by some hacker two days ago. I cant see any pictures too

 

[Zaki]

< = defer>


I know guys this is simple. but actually these things are for the newbies or the persons with less experiance. people like miko, cp, spelling and others are so experts. what I want actually that new guys make effort and post their parts here so we can understand their modeling approach. after that we will post our part so they can understand our modeling approach. experiance peoples know how to model a drill or endmill. but new persons firstly confused then slowly take the action. Its bad to know that someone hacked our loving site

. is it ok now or not???

 

[palamrinder]

i am a newbie. can someone elaborate more on this. I have data pertaining to helix angle 18, web at tip .025, clearance dia .110, margin .020, point angle 90, lip relief angle 17, land .070, flute length 1and drill size 3mm. I have to model a drill to these specifications and make sure it is readily changed for any given set of values. I've seen couple of different approaches and managed to generate the curve using equations, but could not make the helix. got a help file, but it was for solid works, which showed it to be pretty easy, but i culdnt find a helix command in pro e itself ( [url]http://www.cs.berkeley.edu/~sequin/CS285/PAPERS/drill_modeli ng.pdf#search=%22drawing%20a%20twist%20drill%20%22 [/url]) can some one here help me out.

 

[rmckinley]

palamrinder, there is a helix command in wildfire, however, you have to be careful using it because it produces geometry that is different than that produced by actual grinding wheel passes (unless you correctly calculate the cross-section). To create close approximations of drill geometry, I use a technique where i create patterned revolvedcuts with the cuts having the profile of the grinding wheel. Obviously, this is not ideal but it works and is a bit easier than deriving equations for the cross-section of the flutes. It also makes it easy and quick to build CNC programs using the geometry because the actual machine moves are incorporated (as grinding wheel axes), as well as the grinding wheel geometry.


If you are trying to build "automated drill design software," this technique may not be your solution. You will have to resort to drivinghelical sweeps and other geometrywith equations to describe their cross-sections.AnAPI like thatdescribed in vijayaraghavan's thesis also exists in wildfire. However, if you have already defined your curve in wf, I'm not sure you have to go through all that trouble. You may be able to use relations to prompt for your values and calculate your curve upon regeneration. You simply have to create your helical swept cut using the curve you created (driven by your equation in the model relations) and it will update based upon the prompts answered by the user when they regerate the model. I have built program models of drillsbut I have never gone through the trouble of creating a model that completely mimics the "boolean subtraction" of grinding wheels for all of the geometry -- or that completely governs the interaction between multiple features with shape equations.For example, when changing the point angle of the drill, other geometry would require a change in order to maintain radial rake,and these changes likely require an adjustment to the paths of grinding wheels. There is also the question of what the grinding wheel geometry must be. If you drive the geometry with an equation, you still must determine the shape of thegrinding wheel. I have found that the patterned cut technique is extremely close when used with the simplecone geometry for the point. It results in a faceted model but of course you can adjust the spacing between cuts to minimize the error.


View attachment 2683

 

[palamrinder]

Thanks rmckinley I was able to generate the curve using equations. It was creating a helical sweep that was giving me odd shapes. I had the crossection from the "thesis". But could not protrude it along the curve. Using seep gave error that trajectory is invalid. Using helical sweep, does not pick up the trajectory as it needs a path and axis of rotation and creates something like spring. If i intend to make cut in a cylindrical bar i dont have profile for making the cut and moreover i think i'll be needing 2 different curves.

 

[rmckinley]

Actually, I believea helical sweep orients the section parallel to the helix axis and the section that you developed from an equation is oriented normal to helix axis. A better alternative than helical sweep,(and the approach I use for cosmetic models), is to create the cuts using a general blend. You just have to calculate the rotation in Z for your depth between sections -- based on your helix angle. Your equation-driven curve is the sketched section for the cut (which you have to copy into multiple sections for the blend feature). This way, your section is oriented properly and there is no challenge of defining the curves for the helix. This assumes that you are starting with a solid cylinder and usingyour curve to create a"helical" feature to cut away the flutes.

 

[palamrinder]

Thanks. I agree with you on section being parallel to helix axis. I sent you a pm.