Taperlock HTD -vs- AT5 with setscrew

Almost forgot, i do have over 20 of GT2 / 20 teeth pulleys thrown in a bin as they are useles, new china cr@p.

.... my 5cent suggestion .... HTD is for hight power transmission where AT is not .... AT-T and some of 0 backslash (actually there are some special AT with double profile in same section fore reduce backslash) is built for servo or similar ... HTD for direct drive without special control .... plus, check these variable: "maximum force allowed for the belt tension at same belt size"/"money" .... and you will understand the differences ...

bkt
 

tommylight wrote:

I have some mounted on a non finished mill, HTD5,

Quite sure .... think you use a little bit force for tensioning image missing /media/kunena/emoticons/cheerful.png ( think you have some power on your hand ) .... Seriously I have to congratulate you for the work you do here on the forum .... in these days to remind me of the work I left halfway through I followed back the posts of grotius, yours (your thanks have become synonymous with posts to follow for me) and udos .... for more I also found mine I work a year ago on a stick with peek written ..... until I saw the udos comments I didn't know what it was for ....

Thanks
TommyLight ...
      

arvidb wrote:

The AT profile is probably optimal; it's supposedly optimised for low/zero backlash. The question is what is most likely to cause problems on a mill: a taperlocked HTD pulley (possibly backlash from the HTD profile?) or a zero-backlash AT5 pulley attached using only a setscrew on a filed flat?

Edit: That is, if I could find AT5 pulleys with taperlock then I would get that, but alas...
 
 

Is the lack of taper-lock or QD bushing AT5 availability due to location?

Do you have a lathe available?  If so, there are some fairly easy options available way better than a set screw.

And yes, AT5 is significantly better for positioning than HTD.

 

spumco wrote:

Is the lack of taper-lock or QD bushing AT5 availability due to location?

Do you have a lathe available? If so, there are some fairly easy options available way better than a set screw.

I'm in Europe and I just haven't been able to find taper-lock or QD AT5 from any kind of reputable, online source. (I don't want to order noname crap from China.) I'm probably just bad at looking?

I do have a lathe but I'm not setup to turn tapers (no compound). But those keyless hubs might be just the thing! Turning precise cylindrical bores is not a problem. Thanks!

E.g. www.agrolager.de/product_info.php?products_id=40007185


However...

tommylight wrote:

I do not think it is from the type of pulley/belt, it is probably due to bad pulley or belt teeth.
I have some mounted on a non finished mill, HTD5, no backlash at all. But i am using belts and pulleys yanked out of old machines.

I think you're right: I already have some AT5 pulleys, bought from Technobots Ltd in 2013, and I also realised I have an HDT5 setup (just not the size I need) bought quite recently from Agrolager. I did some testing: I clamped one pulley in a vice, made a mark on the belt with a permanent pen, and then held the other pulley in my hand, tensioned the belt and felt/watched for any backlash. I did this with both the AT5 setup and with the HTD5.

The result: I can see and feel some backlash with the AT5, but nothing at all with the HTD5! These are taperlock HTD5's from Agrolager . Both types have much less backlash than the transmission in Muzzer's video. I can see the AT5 belt slide a few tenths of a mm, maybe 0.5 mm at most.

I think I'll order the right size HTD5 from Agrolager then as well as another set of AT5's, just to see if the ones they've got are better than the old Technobot ones. Guess I need a new belt too.

I tried to say .... beyond all that is needed more is the possible tension. HDTs are power belts .... it is obvious that you can "pull" more. If the system allows it (and an old lathe certainly can) you will pull the HDTs a lot and you will have less backslash ... if the system does not allow it ... then you just have to use the ATs which are more precise .

.... for european production .... incredibly many taper locks are still produced in europe .... in italy, romania, slovenia, poland .... in germany i don't know but some special types sure yes .....

bkt