4729Re: 1-2-3 Blocks
- Nov 7, 2005Every member of this group who has purchased an economy set of 1-2-3
blocks have probably asked themselves the question: "What were they
thinking?". I attempted to enlarge the untapped holes to 3/8" by
using a carbide boring bar. All that I accomplished was to break the
You mentioned that turning down a piece of threaded rod is "not a
very good solution". I think it's a great solution and I commend you
for posting it! You should only have to turn it down to about 11/32".
If you are concerned with stripping the threads an alternate solution
is to make a stud with 3/8"-16 threads 1/2" long on one end, 5-16"-18
1/2" long on the other end and 11/32" dia. in the middle. One end
engages a t-nut in the table slot, and the other end engages a 5/16"-
18 flange nut. You could make one 2" long for one block, 3" long for
two blocks, or 4" long for mounting a lower block flat, and the upper
block on its edge. This should improve the useability of these blocks
--- In GrizHFMinimill@yahoogroups.com, "lecodtl" <nospam@b...> wrote:
> I believe that my set of 123 blocks came from Lathemaster. I
> them when I bought some other stuff to save shipping. I was very
> frustrated to discover that the 3/8 bolts that fit the threaded
> in the blocks won't pass through the unthreaded holes in the same
> blocks. I expected I would be able to bolt them together to create
> things similar to angle plates or other shapes to create fixtures.
> But with smaller holes, this can't be done. I would definitely not
> have purchased them if the vendor had disclosed that the bolts for
> the threaded holes wouldn't clear the unthreaded holes. This is
> defective merchandise, in my opinion.
> I discovered that the blocks are so hard that I can't drill the
> larger. Not only that, after drilling them during manufacturing,
> they left large burrs in the holes in the blocks. The burrs are
> hardened. I had to deburr them by driving a steel rod through each
> passage to break out the hardened burrs.
> To use these blocks, I finally cut some threaded rod, chucked it
> the lathe, and turned off the tops of the threads so that the
> threaded rod would clear the unthreaded holes. Now I'm concerned
> about how hard I can tighten them without stripping the threads.
> a very good solution, but a solution of sorts.
> Is it normal for 123 blocks to come like this? I basically
> that I had been stupid in assuming that the unthreaded holes were
> when the product description only stated that the threaded holes
> 3/8-16 and said nothing about the diameter of the unthreaded
> Should I try to get the vendor to take these back as defective and
> give me a set that have holes that will let the 3/8" bolts pass?
> In other words, by definition of the use for 123 blocks, is a block
> with 3/8-16 holes which can't be bolted to another one with
> 3/8 bolts defective, so that a vendor selling such blocks is being
> unethical not to mention that 3/8 bolts won't clear the unthreaded
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