How specify drilling machine?

Answer 1

A vertical drill press is a large drilling machine that stands on a very heavy steel base. A 3" steel column extends up either about 6 feet for a floor model or 3 for a bench model. At the top of this column is an elongated box with the motor at the back, driving a shaft with a 4 tier pulley above it. The front of the box contains a hollow shaft with a spindle inside it. The spindle also has a 4 tier pulley on top. The hollow shaft can be wound up and down by the side control lever. lowering or raising the drill shaft and chuck, A belt between the 2 pulleys drives the spindle and the chuck connected to it's lower end. In the middle of the column, a table, usually about 15 " square can move up and down the column to adjust work height.

Answer 2

Normal pillar drilling machines (Drill Press) are specified basically by the size of hole the machine can drill in Mild Steel i.e a 16mm machine can drill holes upto and including 16mm dia in mild steel. The speed range of a drilling machine is related to the size e.g. machines for small holes down to 1mm can have speed ranges up to 8000rpm. Larger drilling machines more suited for drilling holes. up to 25mm will have a more limited range. A machine which is used to drill larger holes ( >15mm) is not generally suitable for drilling small diameter holes (< 1 mm). Smaller machines are provided with permanent chucks whilst larger machines gnerally include morse tapers for fixing the drills.

Most pillar drills are manually fed using a rotating lever driving the vertical motion of the spindle. Larger machines can have power drives feeds.

A belt driven spindle is often a convenient low cost option but there is a tendency in modern times to use geared /inverter drives.

When drilling holes in a material a number of factors should be considered including

Material being drilled

Hole size

Hole quality.

Speed /Feed required

Depth of hole

Through or Blind Hole

Need for coolant

Capacity of drilling machine

Method of work holding. Hand held, vice, clamped

Orientation of drill (horizontal , vertical drilling, angle

Swarf control

Answer 3

A drill press is is a large drilling machine that stands on a very heavy steel base. A 3" steel column extends up either about 6 feet for a floor model or 3 for a bench model. This machine is used to drill very accurate holes in many mediums, wood, metals, plastics,etc. Most common home drill presses will accept bits up to 1/2" diameter, and have a 6-9" throat. The advantages of a drill press include drilling larger holes and repeated accurate holes by use of simple jigs. -Industrial drill presses can be huge and take many different tools such as 'milling' bits and 'square hole' drills. They often have a coolant feed for heavy metal drilling.