39 4th axis: PTD-125 (Atmosphere) (Clone)

JIA SHI KE MACHINE Co.,Ltd

39.1 Scale Panel Size (PTD series, pneumatic brake)

Project		Unit	Model
Project		Unit	PTD -125	PTD -170		PTD -200			PTD -250
Disk diameter		mm	ø130	ø170		ø210			ø250
Diameter of center hole of disk surface		mm	Ø40	ø67		ø67			ø67
Center sleeve inner Hole diameter ( Optional)		mm	_	Ø40h7		Ø40h7			Ø40h7
Diameter of center penetrating hole		mm	Ø30	Ø40		Ø40			Ø40
Center Height ( Vertical position)		mm	110	135		160			160
Table Height ( Horizontal horizontal position)		mm	145	152		152			160
Workbench T slot width		mm	12h7	12h7		12h7			12h7
Guide Key width		mm	14h7	18h7		18h7			18h7
Minimum set Unit		Deg.	0.001	0.001		0.001			0.001
Segmentation Precision		Sec.	40	20		20			20
Repeat Precision		Sec.	4	4		4			4
Locking Mode ( barometric pressure usage)		kg/cm2	5	5		5			5
Locking torque		Kg-m	9	31		31			31
Servo Motor Type	FANUC	Taper shaft with key	Alpha 2i/ Beta 4is	Alpha 4i/ Beta 8is
	Mitsubi shi (HF)	Taper shaft with key	75NT	54nt/104nt
	Mitsubi shi (HF)	Straight axis	105NS	54ns/104ns
Deceleration ratio		-	1/60	1/90			1/90			1/90
Maximum disk speed (Fanuc Alpha series rotate speed calculation)		r.p.m	66.6(mot or4000rp m)	44.4			44.4			44.4
Allowable load inertia capacity		Kg· cm · sec²	2	5.4			8.3			11.7
Allow workloads	Verti cal	Kg	50	75			75			75
	Use Tailstock	Kg	100	150			150			150
	Horiz ontal	Kg	100	150			150			150
allowable load (When the turntable is clamped)	F	kgf	1000	1450			1450			1450
	Fxl	kgf · m	45	100			100			100
	Fxl	kgf · m	12	20			20			20
Allowable cutting torque		kg •m	9		18			18		18
Total weight ( no motor included)		Kg	35		50			55		58

39.2 Standard precision (Japan JIS Precision Test standard )

NO.	Check items		PTD-125	PTD-170	PTD -200	PTD -250
1	true Disk straightness ( Lower Middle)	Total length	0.01
2	The offset of the plate surface	every 300mm	0.015
3	Parallelism between disk and bottom	Total length	0.02
4	Deflection of center Hole	Front	0.01
5	Verticality of plate and bottom	Total length	0.01
6	Straight angle of plate and bottom guide key	Total length	0.02
7	Precision of Segmentation ( Optical measuring instrument, laser measurement)	Cumulative	40 "	20 "	20 "	20 "
8	Between the guide keys of the rotating worktable and the two centerline of the tailstock and the bottom surface Parallelism	every 300mm	0.02
9	difference between rotation table and tailstock centerline height ( footer Higher)		0.02

39.3 Add to Introduction to Precision sub-panel appearance mechanism

39.4 Appearance Organization chart

The valves and switches used in this machine are as follows:

Part number	Name	Manufacturer	Specifications	Number
SIE5429	Proximity switch	IfM	SIE5427 ( always close / havepolarity /2 line)	1
smcfa11610m	Single-Action pneumatic cylinder	AIRTAC	mcfa-11-6-10m	1
SRCE1	Induction switch	AIRTAC	RCE (2M)	2
Syj5120-5lzd	Five-port two-bit solenoid valve	SMC	Mvsy-156-4e1 1.5~7kgf/cm²	1

39.4.1 Solenoid valve

solenoid valve receives clamping instructions (power on, accumulate magnetic status) , clamp the piston by the pressure to the worm wheel side, so that the score folder The is tight on the platform. The friction of this piece is clamping torque. when the disc is rotated, the solenoid valve must be ( power off, no accumulated magnetic status ) Otherwise the lock will be forced to operate, severely damaging the degree of division Disk precision.

39.4.2 Turntable Clamp / Relaxation Induction Switch

Use the clamping induction switch and the relaxation induction switch to check the clamping / relaxed pressure condition.

※ pressure setting of inductive switch: minimum set to 1.2kg/cm2. The maximum pressure value is 7kg/cm2。

Electrical switch Position diagram

39.5 Installation and preparation work

Remove the packaging, remove the rust inhibitor with light oil, prohibit the use of thinning agent (thinner), otherwise the machine paint or paint will be damaged.
to move the dial to the machine and install it on a matching processor.
checks to see if there are any tiny edges or protruding edges at the base of the proposed configuration and the.
the sub-disk is mounted in a fixed position so that the bottom guide key is embedded in the machine tool's T slot.
with the attached bolts and clamping blocks to tighten the NC dial

39.6 Installation Considerations

air pressure Source Please be sure to use a dryer or three-point combination of ( air filter, pressure regulator and lubricants ), the water filter clean and then access to the division plate, to avoid the air pressure electronic switch, because the water vapor easily caused damage. ( pay special attention to)
work and fittings shall be fitted to the rotary center of the dial and tail seat. when the workpiece or fixture is incorrect , it may damage the machine, machining accuracy, the workpiece and fixtures do not have the correct device in the center of rotation, the plate will be twisted, and resulting in inaccurate or unstable precision errors will reduce the accuracy of the sub disk or resulting in poor processing and worm gear ( bar ) Group of abnormal loss.
to process cutting fluids and to prohibit the use of water-soluble coolant containing phosphoric acid.
Please reconfirm the output of the machine tool to the operating voltage of the distributor solenoid valve is correct (AC110V,DC24V, ac220v) , to avoid unnecessary electrical switch damage.
the solenoid valve on ( power on ) is locked. Off ( no power accumulate ) to relax. (PLC Program drawing please set correctly ).
It is true to install the air pressure source required for the fastening of the sub disk ( describes the following)

※ do install the sub-disk lock ( braking ) Air pressure Source

When the processing is placed, the sub plate shall be locked.
when the degree plate is positioned for processing, the sub plate shall be machined under the braking state ( the solenoid valve is energized, the accumulated magnetic state ) .
when the divide is circled or continuous cutting , Make sure that the sub-disc is relaxed state , the solenoid valve must be ( break power ,not accumulated magnetic state ). If the sub-disk in the lock state ( solenoid valve power , accumulated magnetic status ) under rotation or add work , the brake mechanism and worm gear will cause abnormal wear and tear.
air pressure source Please be sure to use the dryer or three-point combination ( air filter , pressure regulator and lubricant ), filter water vapor and then access the dial, Avoid the air pressure electronic switch, because water vapor easily cause damage.
This product provides two terminal connectors (PT1/4), located above and rear, can choose the suitable one to use.
The locking and relaxing action is controlled by the solenoid valve in the disc machine.
air pressure is 5 ~ 6kg/cm².

In order to keep JSK rotary table in a good condition in the long run, the following adjustments and maintenances are inevitable:

Finding/Offsetting the zero position
Checking the worktable backlash
Setting backlash between Worm shaft and gear
Adjusting the zero-point guide block
Adjusting backlash between the worm gear and motor gear.

Finding/Offsetting the zero position

When the NC controller send a “Return to home” comment to the rotary table, the table homes in the clockwise direction as viewed from the platter/spindle.
When the micro-switch reaches the zero-point guide block (set at 1° ~ 3°), the rotary table starts to slow down and stabilizes at the mechanical home position. Measure the distance between the home position and real zero point by finding the variance in the horizontal direction via the height gauge. (Please see below diagram)

The height gauge

Enter the measured difference into the NC control for zero offset parameter.

Checking worktable backlash

The worktable backlash varies with temperature. When the temperature is 20℃, the minimum amount of backlash of worm gear ranges 10 to 15. The backlash decreases by 10 as the temperature increases by 10℃; vice versa, the backlash increases by 10 as the temperature decreases by 10℃.

Mount a dial indicator to the inside of the T-slot of the worktable.
First, insert a steel bar into another T-slot. Slowly push up the bar with a constant strength of 15~20 kilogram. Second, remove the bar and read the figure from the dial indicator. Third, insert the steel bar into the T-slot again, slowly push down the bar with the same strength, and read the other figure from the dial indicator. Forth, find the difference between the two figures which should be the worktable backlash

If the backlash amount is entered into the servo control as an adjusting parameter, the backlash can be adjusted to zero.

Setting backlash between Worm shaft and gear

An excessive amount of backlash between worm shaft and gear would lead to abnormal vibration, resulting in increasing the cutting resistance. On the other hand, a very small amount of backlash would make the worm gear over-heated, or even get the worm gear stuck and further higher the value of electric current.

Thread of “dual lead worm” is designed from small to large pitch; the feature provides easy adjustment on the backlash between worm and worm gear. By shifting the worm longitudinally, the highest indexing accuracy is maintained on worktable. Please see details of adjustment as follows:

Find the worm shaft cover on the lower side of side panel of rotary table

Loosen the M4 screw used to fasten worm shaft cover

The M4 screw

Utilize the fastened M5 screws to take the cover away.

On the base of worm shaft assy, you can find six M7 screws used for fastening and six M5 stop-screws used for adjusting backlash.

The M7 screws

The M5 stop-screws

Equally loosen the M5 stop-screws

Equally fasten M7 screws in order to further push the base of worm shaft assy, accordingly causing some movement of the worktable.

Perform the above-mentioned “Checking worktable backlash” to check if the backlash stays within 0.01mm. If it doesn’t stay within 0.01mm, please repeat step 5), 6), and 7) until the adjusted backlash fits.

Adjusting the zero-point guide block

Loosen 3/8 stop screw of oil drain plug, and then drain lubricant.

Find the round cover on the upper side of side panel of the rotary table

Loosen the M4 screw used to fasten the round cover

Utilize the fastened M5 screws to take the cover away. Then the zero-point guide block can be found in the hole

Loosen the M4 stop screw of the zero-point guide block

Adjust the zero-point guide block. The recommended range for adjustment is ± 5°.

After finalizing the adjustment, fasten the stop screw M4 of the zero-point guide block, and restore the other parts.

Adjusting the backlash between worm and motor gear

Adjust the distance between worm and motor gear to address certain issues such as abnormal sound after installation, excessive current load due to a tight backlash…etc.

Loosen M8 stop screw of the adjusting hole in order to slightly enlarge the distance between worm and motor gear.

Loosen the motor-screws (which is used to fasten motor), and push the motor toward the back panel of rotary table. Then slightly tighten the motor-screws. By doing so, we can generate some spaces for adjusting the backlash.

Adjust the backlash by driving the M8 stop screw. Keep fine-tuning the screw until we find the best-balanced backlash which can minimize the current load and make less loud and sharp sounds while rotating.

Lubricating

In order to ensure the rotary table can perform well in the long term, the use of lubricant is inevitable. Please see the following points for attention:

Lubricant can provide an appropriate oil film, preventing excessive friction, possible scoring, rust and oxidization. (The recommended viscosity grade: ISO VG 150)
While lubricating, please ensure the lubricant will keep pure and can not get dirty. Any dirt, lint or foreign particle permeating the lubricant may damage the worm gear or other key components.
Please fill lubricant until the Lubricant level surmounts the center line of oil window. This is the proper fill level.
The lubricant change frequency actually depends on the usage rate. However, it’s recommended to completely change the lubricant every 6 months.

Audit checklist

No	Item	Daily	Monthly	Annually
01	Does the exterior stay neat and clean?	V
02	Is there any oil leak?	V
03	Can the zero position be correctly found?	V
04	Is there enough lubricant inside the rotary table?		V
05	Is the backlash excessive?			V
06	Is there any abnormal sound while rotating?	V
07	Can the brake work correctly?	V
08	For hydraulic locking system, is there enough oil in the hydraulic source?		V
09	Is the Indexing accuracy normal			V
10	Dose any screw come loose?		V
11	Is every tooling and fixture locked in the correct position?		V
12	Does the center of rotation precisely lie on the center line of the dividing head and tailstock?		V
13	Do the external-line mil-spec connectors come loose?	V
14	Is the flatness of table top perfect?			V