From the perspective of regional indices: According to surveys, the national total index was 49.9% in October, the northern index was 54.1%, the western index was 55.4%, the southern index was 48.6%, and the eastern index was 44.8%. In October, due to the impact of the 19th and northern regions, the Northern Region's inventory early warning index increased; due to the September Chengdu Auto Show overdraft sales in the western region in October, the Western Region inventory warning index increased. According to the association, the auto market began to enter the traditional peak season in October, and the expiry of the purchase tax concession has also become a positive factor in promoting the market demand this month. Based on the optimism of end-of-year demand, and in response to the demand arising from the end of policy withdrawal at the end of the year, dealers replenish stockpiles in preparation for the end of the year. This should be one of the reasons that the dealership inventory warning index in October has risen relative to September. For the next November, the association expects market demand to increase from October. In the survey, the percentage of dealers who believe that market demand “increases†is 59.4%; the proportion that believes that market demand “decreases†is 11.9%; and the percentage that believes that market demand is “flat†is 28.7%. At the same time, the survey showed that the ratio of “good†operation in November was 29.4%, the ratio of “bad†was 8.4%, and the ratio of “general†was 62.2%. Therefore, it can be expected that dealers will continue to improve in November. Hobbing uses a hobbing machine with two skew spindles, one mounted with a blank workpiece and the other with the hob. The angle between the hob's spindle (axis) and the workpiece's spindle varies, depending on the type of product being produced. For example, if a spur gear is being produced, then the hob is angled equal to the lead angle of the hob; if a helical gear is being produced then the angle must be increased by the same amount as the helix angle of the helical gear. The hobbing features for gears are straight, helical, straight bevel, face, crowned, worm, cylkro and chamfering. The two shafts are rotated at a proportional ratio, which determines the number of teeth on the blank; for example, for a single-threaded hob if the gear ratio is 40:1 the hob rotates 40 times to each turn of the blank, which produces 40 teeth in the blank. If the hob has multiple threads the speed ratio must be multiplied by the number of threads on the hob. The hob is then fed up into the workpiece until the correct tooth depth is obtained. Finally the hob is fed through the workpiece parallel to the blank's axis of rotation. Gear Hobbing,Hobbing Machine,Gear Hobbing Machine,Hobbing Machine Price Jiangsu Hoston Machine Tools Co., Ltd. , https://www.hosdunmachinetools.com
Recently, China Automobile Dealers Association released the "China's auto dealers inventory warning index" VIA (Vehicle Inventory Alert Index) shows that in October 2017 car dealer inventory warning index was 49.9%, up 1.2 percentage points from the previous month, is located in Below the cordon. Combined with the previous data, in August China's car dealers inventory warning index was 47.1%, in September this index was 48.7%, so as of October, the index has been below the alert line for three consecutive months. 
Often, during mass production multiple blanks are stacked using a suitable fixture, then cut in one operation.
For very large gears the blank can be gashed to the rough shape first to make hobbing easier.