BLT86 Specifications and Instructions
Model BLT86 Translator
The McAllister Technical
Services' (MTS) Bellows Sealed Linear Translator (BLT) is the finest of
its kind available anywhere. We recognize and appreciate the confidence
our customers have placed in our company and we work hard to earn it.
Despite its modest
price,
the BLT86 will provide years of trouble-free service, especially if the
simple
maintenance is performed.
All BLT86s use
double ball bearings on the jacking screws. The screws and bearings are
lubricated with MoS2
for low friction and long life. All parts are field replaceable. The traveling
flange is supported by three jacking screws and aligned by three guide
rods (see
drawing). All translators are also available
with long strokes, motor drives,
linear encoders, tapped flanges and special heights.
Maintenance
Instructions:
The BLT86 needs only
minimal maintenance. The linear bearings are bronze, and the guide rods 
need
only be kept lightly lubricated and free from dirt, dust and debris. The jacking
screws and bearings do, however, need periodic lubrication. As delivered,
the jacking screws are coated with high temperature lubricant. This coating
will degrade over time, due to bake-outs and moisture in the atmosphere. After
each bakeout, lightly re-lubricate the screws with the provided high temperature
grease or another equivalent. Be especially careful not to use a hydrocarbon
grease such as Felpro C100TM
unless you periodically clean the oxidized residue from all load-bearing surfaces.
The normal bakeout temperature is 150oC,
but higher temperatures can be used if needed. For bakeouts between 150oC
and 210oC, increase the
frequency and thoroughness of lubrication. Remove the motor and limit switches,
if used, prior to bakeout.
Correct chain tension on
the 6 ear model translators such as this is very important. The chain may stretch with
use. This is normal. When assembled, the maximum lateral play in the chain
should be no more than 1 chain width (+/-1/4" each way). Should it become necessary
to adjust the tension on the chain:
-
First remove the retainer
clip and master link from the chain, and then remove the chain from the
sprockets.
-
Using an Allen (hex) wrench,
loosen the three socket head screws that hold the bronze idler sprocket
bearing around the guide rod. Note that the idler sprocket bearing is eccentric
to the guide rod.
-
Replace the chain temporarily,
using only the master link without the retainer clip.
-
Adjust one or more of
the idler eccentrics until the desired tension has been achieved.
-
Tighten the two socket
head screws that are not blocked by the chain.
-
Remove the chain and tighten
the third screw. DO NOT OVER-TIGHTEN THE SCREWS.
-
Replace the chain using the master link and retainer clip.
-
Translate.
On
both the 3 ear and the 6 ear models, the flanges may need to be re-aligned
to parallel after removing or replacing the chain. Should it become necessary
to adjust the alignment of the two flanges,
-
First remove the retainer
clip and master link from the chain.
-
Remove the chain from
the sprockets.
-
Using dial calipers or
some other measuring instrument, measure the distance between the vacuum
faces of the two flanges at three places around the circumference.
-
Adjust the three screws
individually so that the flanges are parallel to within 0.005" (0.12 mm).
-
Replace the chain and
master link.
-
Do science.
Price list
| Model
BLT86 Translator |
| Model |
Stroke |
Clear I.D. |
OAL
Compressed |
Price* |
|
BLT86-
|
2" (50)
|
5.87" (149)
|
3.6" (91)
|
$3,850 |
|
BLT86-
|
3" (75)
|
5.87" (149)
|
3.76" (96)
|
$4,325 |
| BLT86- |
4" (100)
|
5.87" (149)
|
3.93" (100)
|
$4,800 |
| BLT86- |
6" (150)
|
5.87" (149)
|
4.26" (108)
|
$5,750 |
| BLT86- |
8" (200)
|
5.87" (149)
|
4.59" (117)
|
$6,700 |
|
BLT86-
|
10" (250)
|
5.87" (149)
|
4.92" (125)
|
$7,650 |
|
BLT86-
|
12" (300)
|
5.87" (149)
|
5.25" (133)
|
$8,600 |
Dimensions
are in inches (mm) - *Prices are in U.S. Dollars
For tapped flange
(5/16-24 or M8), add $55
For 1" (25 mm) travel
dial indicator, add $150
Stepper
motor drive and limit switches, add $1400
DC
motor drive, limit switches, power supply
and hand-held pendant
switch, add $1350
Stepper motor
controller, first axis, add $1500*
*Additional
axes (may be combined - consult factory), add $750.
|
