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Glass Scale vs Magnetic
A simple number will tell you all.
99% linear scale is running on glass now, so magnetic scale must have some
fetal disadvantage. Sony was only few companies to make magnetic scales before,
Sony killed it 10 years ago. Ford killed focus, Chevy killed Cruze. There must
be some reason. Ford and GM claim unpopular and no demand. So I guess Sony has
the same reason to kill magnetic scales.
Now Few Company spread rumors on
glass scale, how bad the glass scale is, and it's not water proof, doesn't last
and so on. It's funny that those companies were selling glass scale for years,
now they try to convince customers stay away. Do they really contradict to themselves?
In another words, the glass scale they're selling may have some problems, and all
those bad words above should apply. Therefore, for all customer who bought
their glass scales before should go after the seller and ask for compensation
because they didn't disclose the truth about their products when they sell it. Before
they push glass scales sales, now they say glass scale is bad. It’s a joke. By
the way, I sell glass scales since day One, never ever changed.
The truth on glass scales is far
more accurate than magnetic scale. You may ask both type scale labeled as 5um
or 2 tenth, so what's the difference. Keep in mind, 5um or 2 tenth is
resolution, not accuracy. Resolution is what you can read from display unit.
However, the real accountability or repeatability is called accuracy. Both
glass and magnetic scales have error if you don’t calibrate. On glass scale, it’s
called linear error, which is very easy to correct, however, the error on magnetic
scale is called non-linear error. For example, glass scale linear error means
the error is insistent, it’s the same. If error is 2 tenth off on 1” travel, then
if you slide 10” travel, the error will be 2 thousands, which is 0.0002”x10 is
0.002”, error is increase proportionally, then you enter in one fixed
compensation ratio to fix that. However, on magnetic scale, error could be any
number in different travel range, example, 0-1” travel, you may see 2 tenth off,
then 2-3” travel, you may see 3 tenth off, then 3-4” travel, you may see 1.8
tenth off. Therefore, on the same 1” travel, the error is non-insistent, so it’s
really hard to compensate, as a result, when you’re running certain function on
the display unit, you may see difficulties. If you don’t care, you don’t care,
but I think most customers prefer reliable, accurate and easy calibration scale
to begin with.
2nd, on water and dust
poof, If you pour water or spread sands of dusty directly to both glass scale
and magnetic scale, none will last, that’s the truth. On the water proof, we should
call it splash proof, which means wet splash may goes into scale. So both glass
scale and magnetic scale are sealed against wet and dust. Glass scale usually
sealed in 2 or 3 layers and magnetic scale has very thin seal. Also, don’t forget that both scales come with shield
cover, what those covers for, it’s for shielding scale away from splash and dust.
When you mount scale, usually it’s face down, not up, ask yourself, is water
going down or going up. Water 100% is going down, scale cover is face down,
scale is face down, so the water will flow over shield cover and drop on the floor.
People are running glass scale by water jet and edm all the time, if not water proof,
how can glass scale handle it.
3rd, weather scale should
be cut or not. It’s an interesting question. On the standard knee mill, like bridgport
or off brand Bridgeport or clone, there are enough space on the machine to
mount scale, so you should get longer and taller scale to mount, who wants to
cut. The only machine you may need to cut to install is those small mini or bench
type mill, those are toys or hobby. I focus on industrial machine more than
home hobby toys. I don’t sell toys. On
the lathe, cross slide height space is limited, then I have slim scale to overcome,
slim scale height is even less than magnetic scale. On 12 or 13” or even
smaller lathe, you may need slim scales on the cross slide, but on 14, 16 and
18” lathe, the space is high enough and so I suggest you go with normal height scale.
Finally, well build glass scale like
mine last years as well because the glass is commercial grade thick glass. I
don’t want to post any fake numbers on the life span, like 1 year, couple years,
10 years, 20 years or maybe life time. Last or not, only customers can tell. I
don’t want false advertise or misleading. My goal is that when you retire and
pass the machine to next generation, my scale on the machine is still working.
To be honest, I dislike many people,
that in order to push their minority or unpopular products sales or couldn’t beat
my sales, then they spread rumors on majority and popular items all over place.
Sometimes, they contradict to themselves. The truth is that majority of scales
on the market are glass scale, 99% or even higher. More and more companies are
dropping to make magnetic scales. To be clear, very few companies even making magnetic
scale at beginning, and now they all dropped out, so there must be a reason.
Americans don’t know how to drive
stick shift now; auto tranny is in 94% cars. In order to sell standard transmission
car, you can’t say automatic transmission doesn’t last. Auto tranny can go over
200K miles also. The friend of mine, his Toyota Tacoma truck was wrecked after
400K with original engine and auto tranny. So let’s be clear, scale last not, depends
on how well it built, also depends on how well you take care of it, which is the
same on the car truck transmission, how it build and how you take care is the
tpactools dro lasts longer than majority of import units, which has been proven
Good question, the short answer is that my unit is
built for industrial, not a home hobby toys. Commercial and industrial company
is running machine all day long, so they need a reliable unit on the machine. However,
home machinist runs once in a while. If the unit can handle industrial well,
then it’ll handle home shop like piece of cake.
you tell more details how your unit is well built?
Here are few details, 1st. the glass inside
scale is thicker and stronger, glass is a key to a glass scale, it’s very easy
to understand. Look around, see the glass on any office building, then compare
with the glass on your home window. Also, make trip to Home Depot, and look at
different window with different thickness glass, then you’ll know something. 2nd
the bearing sliding on the glass, my bearing is Japanese. If you’re in bearing
business, then you’ll know what I’m talking about. 3rd, data sending
unit, people called reader head, which sending data from scale to the display
unit via long data cable. That little piece motherboard and all electrical
parts in the reader senor head has been tested long enough before production,
and all electrical parts are from quality supplier as well. 4th,
when I place order, I don’t order common unit, which is the same like others. I
usually ask supplier to make the purchase order according my special
requirement. I can’t tell you all because some are commercial secrete or
intellectual property, which is the key to a business and products.
your display unit made of metal or cheap plastic?
All my display unit from 1 to 4 axis
are made of
metal, so it’s metal case, heavy and durable. If you never see what
metal case, you may think plastic case is pretty good, once you see
metal, then plastic looks like a toy and feels like a toy. I don’t sell
0.0001” or one tenth scale necessary?
Usually rookie will ask this question. Here is number
break down. For manual Bridgeport and lathe, maximum accuracy you can reach is
about 0.0005”. I don’t think you can make parts with 2 tenth tolerance on a 50
years Bridgeport. So you only need scale accuracy to match 5 tenth or a little above
to cover Bridgeport. Keep in mind, 2 tenth is less than half of 5 tenth, which
means 2 tenth is more than double that Bridgeport accuracy can reach, so it’s
accurate far enough. Now you may argue with me, 1 tenth is even more accurate,
yes I agree. However, 1 tenth scale is much more difficult to make, unstable, and
more important is that 1 tenth scale has much less lift span than 2 or 5 tenth
scale. So why do I pay more for the something I don’t need. Lathe is the same,
whatever cross slide or carriage travel, accuracy is far away from 2 tenth, so
0.0002” scale will cover perfectly. Keep in mind, 1 tenth scale is not
installed on mill or lathe, and it’s installed on some special measuring device
or equipment in the lab, plus they don’t run those super precision devices all
day long. I haven’t find any supplier can make decent 1 tenth scale reliable,
if you see cheap 1 tenth, don’t buy it, you’ll suffer more than enjoy from long
run. I carry 2 tenth only, and 99% vendor and supplier are focus on 2 tenth as
Since mine is well unit, so I don’t worry about
breaking down in short term. Customer trust me, and I’ll return trust with
quality products. Usually, there are two cases why scale is break down. 1st,
products are defect, which is less likely happen to me. However, if it happens,
I’ll keep my words, and warrantee for 5 years for entire unit, it includes
everything you bought, display unit and all scales, this case will be my fault.
2nd, if it’s customer fault to damage the scale, few examples couple
be, scale is a little short, not cover entire travel, then the scale is over
run, or scale is not mounted in the center of table, then over run from center
to the end, or people who run the machine never take care and clean scale, I
called it abuse. If all those happen, let’s be clear, those are not seller’s
fault, I’ll provide option of free repair if repairable or replace with a
little cost. In order to avoid all of those happen, make sure measure table
dimension before place order, as long as you tell me correct table length, then
I’ll send you scale that long enough to cover travel on all axis. Also, make
sure all scales must be mount in the center of the table, finally, don’t show me
any signs of abuse, so please calibrate scale before initial running, cover up
and clean scale once in a while, if you take care the scale, then scale will
return you with longer life span. Same like oil change on your car, if you
abuse engine and tranny, don’t change oil on time, what’ll happen.
you over descript products and let customer write fake reviews?
People are paying attention on item description and
reviews when buying online. I know better than anyone else. Those fake reviews
and untrue descriptions may drive sales up in short term, however, when
customer discover the truth, they’ll hate products and seller like you never
believe, sometimes, could end up with a lawsuit. I call those sellers are liars
who cheat on review and descriptions. Keep in mind, liar will be a looser. So
as a seller, I’d better be follow all rules and regulations. There is another
case, which happen quite often, and we can’t call it fake review. Customer
bought it, receive and open box, played few days and really like it, then write
5 star reviews. However, short term joy doesn’t last long, and item break down
short after that. On the dro and glass scale, it happens very often. People
bought cheap unit, saved $200 to $300, really like it, write good reviews, then
scale break down in couple month or less than a year. I don’t call it fake
review. My point is that industrial products is different from consumer items,
so customers really have to run it for couple years, then they’ll know if it’s
good or bad, last or not. there are too many victims here, enjoyed cheap unit
for couple month, then break down and come back to me finally. So my words to
those cheap guys are, buying good and reliable products at the 1st
place. Keep in mind, price is not overall of a business especially on
to buy correct unit to fit my mill or lathe?
Look at very top page, there are few size options,
like 9x36 table, 9x42 table, 9x49” table. Make sure you see the word table,
which means 9x36 is table dimension, table is 36” long by 9” wide, and it’s not
length of scale. So all your need to do
is to measure table length, then choose correct option above before add to
cart. Once your table dimension is correct, I’ll send you long enough scale to
cover all travels. When you receive and start installation, make sure mount
scale in the center of the table. If you have a bench or table top mini mill,
please choose bench mill option.