Search:

Anyone?

Hi

I have spent a few hours today trawling various ebay sites and online automation suppliers and cannot find a Gerwah DKN 15/26 6.00mm-6.35mm backlash free coupler. I did get a quote back on a...

Hi ghassall

I don't have experience with these bearings but I can offer a logical POV. I suspect that the bearings were installed incorrectly as face to face configuration. I would expect that...

How about this. If you can map out your desired axial position / velocity we can make a curve that reflects what axial position / velocity you require.

Just like mapping the lift on a cam.
...

I had another idea. Try this curve in the equation.

x = diameter/2 * cos ( t * 360 )
y = diameter/2 * sin ( t * 360 )
z = amplitude * sin ( t * 360 )

It should give sinusoidal motion and...

No problem. I still think there's some bugs in the curve but at least you can now define a curve, project a curve and sweep a profile.

Post a pic of the final product when you run your toolpath. ...

Looking at your pic I think your mirror solution will result in sinusoidal motion of the cam follower. I am trying to visualize the motion of what I have suggested with the rotate. You should just...

The last pic to me is 1 cycle of a sine wave per revolution. If you half your amplitude it will look a lot less dramatic.

That last pic looks OK to me. Look at it in wireframe. What you are seeing in shaded view is the edge rotated, not the actual incremental slice of the profile.

Kill the mirror. I gave you a bum steer in #12. You need to rotate a copy of the sweep about your x axis. Create a datum axis through the x axis and then highlight the sweep, Copy, Paste Special,...

My timing is crap.

Picture please.

I reckon hide that first revolve and the original sweep will appear.

Picture please. The post #12 is wrong. I said mirror when I should have said rotate, sorry.

Hide your first revolve and the groove may be shown if the first revolve is a surface and the...

From your picture I think to achieve 1 cycle you would rotate 180 about your x axis. Are you looking for a full sine wave i.e. + amplitude and - amplitude?

You've just about got it. I think your cylinder is probably a surface but you can make it a solid and the sweep should cut the groove in it.

Are you using surfaces or solids?

And your method is another method again. Once you have sweep the cut you would just mirror the features.

More than one way to skin a cat.

I just projected the curve onto the 2 surfaces of the solid protrusion and then drove the sweep of that curve. When you select the curve it will most likely only pre-select half of the curve. Right...

Hold the phone, I think I have got an easier method.

Here's the solid version with only half of the swept cut. You would now use Copy, Paste Special, then do a rotate by 180 degrees.

Are you making a cam?

Hi Shaun

The attached picture may help. I have shown it in wireframe so you can see the 'original' sine curve and the projected curve onto the semi-circular surface. The projection feature is...

Hi Shaun

Use 'from equation'. It is not very intuitive how to use it so I'll give you a starting point and you can play from there.

x = -diameter/2 + t*diameter
y = amplitude * sin ( t*180 )...

Hi Shaun
The feature you want to use is called a sweep. To create a sweep you need a profile to sweep and a trajectory to sweep the profile along. You need to define a datum curve around the...

Can a moderator please remove posts 15 and 16. Some idiot at my computer keeps posting the same message because they are too impatient and think the post didn't get through.

Thanks guys for the opinions on linearmotionbearings. I saw them on ebay and I thought their prices vs. quality is reasonable. It is reassuring to know that fellow cncers have had good experiences...

Thanks guys for the opinions on linearmotionbearings. I saw them on ebay and I thought their prices vs. quality is reasonable. It is reassuring to know that fellow cncers have had good experiences...

Thanks timber_MG and Mark for the opinions on linearmotionbearings screws. I saw them on ebay and the prices vs quality looks quite reasonable so hearing good responses from fellow 'zoners is...

Hi timber_MG

Could you please post some close ups of the end machining done by linearmotionbearings and your opinion on the quality of the machining.

BTW the z axis looks really good and very...

Hi Guys

Aside of the fact that you can't link to www.cnczone.com, www.practicalmachinist.com is poorly moderated but more importantly has very poor culture. People behaving badly and being...