Have you priced up just buying the pulleys you need? I've made a few V
pulleys in the past thinking that would be the cheapest option but when
I found out the price of standard V pulleys and taper bushes from the
local bearing supplier I don't bother, I just buy what I need off the
I completely understand however it is just another bit of hobby
engineering. I am currently making a stepper driven rotary table, I
could buy but prefer to design and make. The bigger V pulleys I would
(and have) purchase. I made a T2.5 pulley a while ago, 70 tooth I could
not find a source. it was actually a doddle to "flycut" the teeth.
This may be of some use
www.arceurotrade.co.uk/projects/X3-CNC/X3_Belt%20Drive%20Mods.pdf , it
gives somes details of making 5mm pitch HTD pulleys. Not sure whether
you'll have to copy and paste the link.
"www.arceurotrade.co.uk/projects/X3-CNC/X3_Belt Drive Mods.pdf"
Thanks for that Dave, the John Stevensons comments are very interesting.
Do you know the tooth diameter for T3? The silly thing is that I have
previously made an HTD T5 pulley but cannot find my original references!
I found this statement in a PDF file resulting from a search for "HTD
tooth profile dimensions" "The HTD profile is protected by U.S. Patent
Number 4,337,056" so maybe go find the patent on line and see what it
says. Try plugging the number in here
http://patft.uspto.gov/netahtml/PTO/srchnum.htm , I found the patent but
couldn't view the images, IIRC they use TIFF images and I couldn't find
a plugin for Firefox, maybe there is one but I gave up waiting for it to
Looks like maybe the problem is I don't have a PDF plugin anymore as
when I looked at the problem source it referred to a PDF file which if I
put that in the URL bar I could view the individual patent pages fine in
an external viewer. I got rid of the PDF plug in as it was slow and
cumbersome compared to automatically opening the PDF in an external
viewer which doesn't seem to work for the US patent office site at the
moment for me.
Just as a matter of nomenclature, is there such a thing as an HTD T5
I thought there were T5 timing pulleys and 5M HTD drive pulleys, and
that the teeth forms are different (with the T5 being squarer and 5M
-- Peter Fairbrother
Has anyone done that X3 mill modification, and if so is it worth doing?
Is it possible to use a 15mm wide belt if the rib in the cover is milled
out to suit?
Is there a point in the X3 top cover being so heavy-duty? I can't
imagine it contributes to overall rigidity, only being held on with four
long M5 screws.
In the article Dick writes:
"Later on, I thought more about the
splined spindle, and came up with a
completely redesigned head, which
will be the subject of a future article."
Anyone know anything about that, a link maybe?
-- Peter Fairbrother
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