These activities will include hand sawing, band sawing, filing, drilling, chiselling, threading, scraping, lapping and off- hand grinding.
What problems can occur with hand fitting activities?
the problems that can occur with the hand fitting activities, and how these can be overcome (such as defects caused by incorrectly ground drills, inappropriate speeds, damage by workholding devices) 19. when to act on your own initiative and when to seek help and advice from others 20.
What is a sliding fit?
: a fit for mechanical parts that slide on one another.
What is the result of using an incorrectly sharpened drill with unequal lip lengths?
Faults Due To Incorrect Drill Sharpening Result – oversize holes, uneven swarf from each flute, reduced cutting efficiency. Unequal angles (chisel edge off centre) lip heights equal.
Why does my drill bit keep breaking?
There are mostly two reasons why a drill breaks. Deflected breakage is caused by the radial force, the drill bit is broken at the end of flute. Twisted breakage is caused by the large torque, the drill bit is normally broken at the middle of the flute.
How much clearance do you need for a sliding fit?
As in the example above, this requires looking at part alignment and specifying tolerances referencing fit and function. But at a bare minimum, plan on oversizing the hole 0.0015 inches to get a clearance fit.
What is the effect of clearance angle is incorrect?
In general purpose drills, the clearance angle behind the cutting edge is 12°. Too much clearance angle cause the breaking of the lip of drill due to insufficient support.
What will happen to a drill if the operating speed is too fast?
If the speed is too fast (the drill spins too quickly) the drill bit will not bite into the metal, it will just spin without cutting very much. This causes a lot of friction, which overheats the drill bit and makes it dull. If you run the drill too slow, it will just take longer to cut.
Can I use wd40 for drilling metal?
WD-40 will work just fine as a cutting oil. For drilling holes in steel that’s 1/8 in. or thicker, use cutting fluid or a multipurpose oil like 3-IN-ONE. Lubricating the bit reduces friction and heat buildup, which makes drilling easier and your bits last longer.
What are the health and safety requirements for hand fitting?
What are the health and safety requirements, and safe working practices and procedures required for the hand fitting activities undertaken? Health and safety requirements, safe working practiced and procedures required for the hand fitting activities untaken include always wearing your personal protective equipment.
How are hand fitting techniques used in the workplace?
The learner will understand the safety precautions required when using hand fitting techniques, and when using hand and power tools. The learner will be required to demonstrate safe working practices throughout, and will understand the responsibility they owe to themselves and others in the workplace. Learning outcomes
What are the health and safety requirements for mechanical maintenance?
1. Describe the health and safety requirements, and safe working practices and procedures required for the mechanical maintenance activities undertaken. There are many different regulations that are used for health and safety requirements these include, PPE, COSHH and PUWER.
What are the components of safe work practices?
Safe working procedures and safe work practices usually have seven components namely (i) purpose, (ii) scope, (iii) responsibility, (iv) description of the process or guidelines, (v) reference, (vi) enclosures, (vii) forms and records. They are the internal documents of the organization.
