![]() The Crossrail has screws for vertical and crossfeed of the toolheads and a screw for elevating the rail.Usually, two toolheads, are mounted upon the Crossrail which are called railhead.it must be horizontal irrespective of its position. The Crossrail when clamped should remain absolutely parallel to the top surface of the table, i.e.The Crossrail may be raised or lowered on the face of the housing and can be clamped at any desired position by manual, hydraulic or electrical clamping devices.This construction ensures the rigidity of the machine. The Crossrail is a rigid box-like casting connecting the two housings.These screws operated either by hand or power. The housing encloses the Crossrail elevating screw, vertical and crossfeed screws for tool heads, counterbalancing weight for the Crossrail, etc. Two side-toolheads also slide upon it.The front face of each housing is accurately machined to provide precision ways on which the cross rail may be made to slide up and down for accommodating different heights of work.They are heavily ribbed to take up severe forces due to cutting. ![]() The housings also called columns or uprights are rigid box-like vertical structures placed on each side of the bed and are fastened to the sides of the bed.Lathe Machine: Parts, Types, Operations, Attachments Housing.13 Main Difference between NC and CNC Machine.In some machines, if the table overruns, a large cutting tool bolted to the underside of the table will take a deep cut on a replaceable block attached to the bed, absorbing the kinetic energy of the moving table.Hydraulic bumpers are fitted at the end of the bed to stop the table from overrunning giving cushioning effect.In a standard planer, the table is made up of one single casting but in a divided table planer there are two separate tables mounted upon the bedways.Long works can also rest upon the troughs. At each end of the table, a hollow space is left which acts as a trough for collecting chips.T-slots are provided on the entire length of the table so that the work and work holding devices may be bolted upon it.The planer table is a heavy rectangular casting.The table supports the work and reciprocates along with the ways of the bed.The ways are properly lubricated and in modern machines oil under pressure is pumped into the different parts of the guideways to ensure a continuous and adequate supply of lubricants.The guideways should be horizontal, true and parallel to each other.Three or more guideways may be provided on a very large wide machine for supporting the table.The bed is made slightly longer than twice the length of the table so that the full length of the table may be moved on it.It is very large in size and heavy in weight and it supports the column and all other moving parts of the machine. ![]()
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