Silk purse from a Sow's ear
Posted: Fri May 30, 2025 8:31 pm
I will admit first off, to generally despising cheap Chinese tools for the usual reasons, none of which include their usually being anywhere near being fit for use other than to keep boats from straying from their mooring.
A notable exception for me is when I need an outrageously unusual tap or die, which often can only be purchased from China for about $10 and then mailed to me for $4 (FOUR DOLLARS! I cannot mail a float valve across town for less that around $7!!) Sometimes those taps/dies are great and sometimes they simply reinforce the stereotype for Chinese tools (BTW, is it fair to call it a "stereotype" if something is usually true so much of the time?)
Now to the transformation: needing a Semi-Universal Dividing head for some time, I looked at the usual sources for good tooling - USA; nope, UK; nope, Germany; nope, Switzerland; nope. China; MILLIONS OF 'EM! All ridiculously cheap and with free shipping even at 60# plus on the weight.
So, what do you get? Well, you get an enormous chunk of cast iron with the removable chuck all but permanently welded on, due to improper fit at the threads. A mismatched bunch of ill-fitting screws, screws that have socket heads but are fit to countersunk holes which will interfere with movement and keep the device from tilting (even the Parts List lists the wrong screw!!), sector arms that seem to be welded to the index plate and an index needle assembly that is so sloppy that it really doesn't matter where it is positioned as you can let it drop into any one of 1/2 dozen holes and it won't make the head move. Crown it all off with cheap dime-store washers and you have yourself quite the mess. It's ugly, cheap-looking and unfunctional. In my opinion it's not a tool; it's a kit, and not a terribly good one at that.
Finally, and best of all, the parts are greased with the standard Chinese grease which appears to be a concoction of marmalade, thoroughly mixed with valve grinding paste. With this mixture, your parts will mesh perfectly within a day of use and then be completely worn out by day 2.
However, all is not lost: a disassembly and total cleanup of every part, followed by mandatory deburring of EVERYTHING (!) brings the parts to a useful state. Then proper greasing and adjustments make the device remarkably accurate (.0008 on the chuck and .0003 at the dead center) with all but indiscernible backlash. Replacement of ill-fitting screws, new washers, remachined sector arms and the purchase of a new the index needle assembly from a GRIZZLY (TAIWAN) dividing head made things extremely accurate and repeatable, as the GRIZZLY replacement is a very well made part. The crowning touch of ergonomics was the replacement of clamping bolts with adjustable ball-handled clamping handles on both the dividing head and tailstock which combined with all of the above, finished turning the device into something both functional, highly accurate, and enjoyable to use. The direct-indicating pointer is still horrible, being made from what appears to be a beer can or similar quality material, but that can wait for another day.
A $210 lump of junk, plus around $60 worth of quality replacement parts from a TAIWAN manufacturer of similar, pricier product (index needle assembly), a quick sprint through the MSC catalogue for the ball-handles, and 2 days of work yielded a tool capable of extremely accurate work on par with a Swiss or an old Brown & Sharpe dividing head(from which this thing was copied). That Brown & Sharpe head will set you back $1200 or more (if you can find one) and very often will be pretty worn out, as they have not been made for (I believe) around 50 years.
If you have access to a machine shop, this is a very economical device if you have the wherewithal and time to fix it...if not, then the $650 GRIZZLY or similar TAIWANESE tools is your next best bet...or buy the one that Kevin Pharis is offering for sale in the Classifieds
A notable exception for me is when I need an outrageously unusual tap or die, which often can only be purchased from China for about $10 and then mailed to me for $4 (FOUR DOLLARS! I cannot mail a float valve across town for less that around $7!!) Sometimes those taps/dies are great and sometimes they simply reinforce the stereotype for Chinese tools (BTW, is it fair to call it a "stereotype" if something is usually true so much of the time?)
Now to the transformation: needing a Semi-Universal Dividing head for some time, I looked at the usual sources for good tooling - USA; nope, UK; nope, Germany; nope, Switzerland; nope. China; MILLIONS OF 'EM! All ridiculously cheap and with free shipping even at 60# plus on the weight.
So, what do you get? Well, you get an enormous chunk of cast iron with the removable chuck all but permanently welded on, due to improper fit at the threads. A mismatched bunch of ill-fitting screws, screws that have socket heads but are fit to countersunk holes which will interfere with movement and keep the device from tilting (even the Parts List lists the wrong screw!!), sector arms that seem to be welded to the index plate and an index needle assembly that is so sloppy that it really doesn't matter where it is positioned as you can let it drop into any one of 1/2 dozen holes and it won't make the head move. Crown it all off with cheap dime-store washers and you have yourself quite the mess. It's ugly, cheap-looking and unfunctional. In my opinion it's not a tool; it's a kit, and not a terribly good one at that.
Finally, and best of all, the parts are greased with the standard Chinese grease which appears to be a concoction of marmalade, thoroughly mixed with valve grinding paste. With this mixture, your parts will mesh perfectly within a day of use and then be completely worn out by day 2.
However, all is not lost: a disassembly and total cleanup of every part, followed by mandatory deburring of EVERYTHING (!) brings the parts to a useful state. Then proper greasing and adjustments make the device remarkably accurate (.0008 on the chuck and .0003 at the dead center) with all but indiscernible backlash. Replacement of ill-fitting screws, new washers, remachined sector arms and the purchase of a new the index needle assembly from a GRIZZLY (TAIWAN) dividing head made things extremely accurate and repeatable, as the GRIZZLY replacement is a very well made part. The crowning touch of ergonomics was the replacement of clamping bolts with adjustable ball-handled clamping handles on both the dividing head and tailstock which combined with all of the above, finished turning the device into something both functional, highly accurate, and enjoyable to use. The direct-indicating pointer is still horrible, being made from what appears to be a beer can or similar quality material, but that can wait for another day.
A $210 lump of junk, plus around $60 worth of quality replacement parts from a TAIWAN manufacturer of similar, pricier product (index needle assembly), a quick sprint through the MSC catalogue for the ball-handles, and 2 days of work yielded a tool capable of extremely accurate work on par with a Swiss or an old Brown & Sharpe dividing head(from which this thing was copied). That Brown & Sharpe head will set you back $1200 or more (if you can find one) and very often will be pretty worn out, as they have not been made for (I believe) around 50 years.
If you have access to a machine shop, this is a very economical device if you have the wherewithal and time to fix it...if not, then the $650 GRIZZLY or similar TAIWANESE tools is your next best bet...or buy the one that Kevin Pharis is offering for sale in the Classifieds