YCM B7G (Graphite)

Question 1

What are the X, Y, and Z axis travel dimensions of the YCM B7G?

Answer 1

The X-axis travel is 25.98”, Y-axis is 20.08”, and Z-axis is 15.75”, allowing for precise machining of medium-sized parts.

Question 2

What type of drives and encoders are used in the B7G’s axes?

Answer 2

The B7G uses AC digital servo motors with absolute pulse encoders, ensuring accurate and responsive axis movements without the need for homing after power loss.

Question 3

What material is the bed of the B7G made from, and why is it beneficial?

Answer 3

The bed is made from Meehanite cast iron, which provides high rigidity and excellent vibration damping, enhancing machining accuracy and stability.

Question 4

What type of guideways are used in the X, Y, and Z axes of the B7G?

Answer 4

It uses linear roller bearing type guides on all axes, offering smooth motion and high load capacity for improved precision.

Question 5

How does the ballscrew pitch and diameter contribute to the B7G’s performance?

Answer 5

With a fine ballscrew pitch of 0.31” and a large diameter of approximately 1.77” to 1.96”, it reduces backlash and increases stiffness, enhancing accuracy and rigidity.

Question 6

What is the linear positioning accuracy and repeatability of the B7G?

Answer 6

The linear positioning accuracy is 0.00012”, and the repeatability is ±0.000080”, ensuring high precision in machining operations.

Question 7

What are the rapid traverse rates for the B7G’s axes, and how do they affect productivity?

Answer 7

Rapid traverse rates are 945 inches per minute (ipm) for all axes, reducing non-cutting time and increasing overall productivity.

Question 8

What spindle nose interface does the B7G use, and what advantages does it offer?

Answer 8

It features a dual-contact HSK40E spindle nose, providing enhanced rigidity and precision by ensuring both taper and face contact with the tool holder.

Question 9

What is the tool clamping force of the B7G, and why is it important?

Answer 9

The tool clamping force is 2,700 lbs (1,225 kgf), ensuring secure tool holding and stability during high-speed machining operations.

Question 10

What is the spindle speed range of the B7G, and how does it benefit machining processes?

Answer 10

The spindle speed ranges from 100 to 30,000 RPM, allowing for high-speed machining suitable for fine finishing and precision work.

Question 11

At what spindle speed does the B7G achieve full horsepower, and why is this significant?

Answer 11

Full horsepower is achieved at 12,000 RPM, providing optimal power for demanding machining tasks at higher speeds.

Question 12

What are the continuous and peak (25% ED) power ratings of the B7G’s spindle motor?

Answer 12

The continuous power rating is 10 HP (7.5 kW), and the peak power at 25% duty cycle is 13 HP (9.5 kW), offering flexibility for various machining requirements.

Question 13

What is the spindle torque at continuous rating and at 25% ED for the B7G?

Answer 13

At continuous rating, the spindle torque is 52 ft-lbs (71.8 Nm), and at 25% ED, it is 78 ft-lbs (105.75 Nm), providing strong cutting power.

Question 14

How does the B7G ensure thermal stability in the spindle during operation?

Answer 14

It utilizes a chiller unit for the spindle jacket and grease lubrication, maintaining consistent spindle temperatures and reducing thermal expansion.

Question 15

What are the dimensions and load capacity of the B7G’s table?

Answer 15

The table measures 31.5” x 20.08” with a load capacity of 1,102 lbs (500 kg), suitable for accommodating sizable and heavy workpieces.

Question 16

What is the capacity and tool change time of the B7G’s automatic tool changer (ATC)?

Answer 16

The ATC has a capacity of 20 tools and achieves a tool-to-tool change time of 1.8 seconds, enhancing operational efficiency.

Question 17

What are the maximum tool dimensions and weight the B7G’s ATC can handle?

Answer 17

Maximum tool diameter is 1.57” (40 mm), maximum tool length is 5.9” (150 mm), and maximum tool weight is 6.6 lbs (3 kg).

Question 18

What are the electrical requirements for operating the B7G?

Answer 18

The B7G requires a 208-volt, 3-phase, 60 Hz electrical supply with a breaker size of 100 amps and a KVA rating of 30.

Question 19

What are the air supply requirements for the B7G, and why is an air dryer recommended?

Answer 19

It requires a minimum air pressure of 80 psi (5.5 bar) with inlet air temperature below 35°C; an air dryer is recommended to ensure air quality and prevent moisture-related issues.

Question 20

What are the floor space requirements and weight considerations for installing the B7G?

Answer 20

The machine requires a floor space of 94” x 95” x 94” and weighs approximately 15,400 lbs (7,000 kg), necessitating adequate space and structural support.

Question 21

How does the Spindle Thermal Compensation Plus (STC) system on the B7G enhance thermal stability?

Answer 21

The STC system uses three thermocouples to provide real-time temperature feedback, which YCM’s proprietary software uses to accurately compensate for thermal growth, minimizing thermal movement during machining.

Question 22

What additional features work with the STC on the B7G to maintain thermal stability in the machine?

Answer 22

The STC system is supported by a spindle chiller, chilled motor plate, oil-air lubrication, and fixed, pre-tensioned double-nut ballscrews, all of which contribute to a thermally stable machine environment

Question 23

What is the purpose of the optional dust collection system in the B7G?

Answer 23

The optional dust collection system, featuring a high ACFM fan and filter bag system, provides high-volume filtration of graphite particles, helping to extend the machine’s lifespan by removing harsh materials from the work area.

Question 24

How does the 5-step dust protection system protect the linear guideways?

Answer 24

The 5-step dust protection system includes a metal scraper, LaCS, double seal, inside seal spacer, and side scraper, all designed to limit graphite ingress and protect the linear bearings, ensuring reliability and productivity.