As with any used machinery, inspections are vital to ensuring a fully functional piece of equipment that will add efficiency and profitability to your business. In the article, Inspecting Straight Side Double Crank Presses, we learn the most important aspects of inspection and what to look out for. When it comes to a used press, fewer hours doesn’t necessarily mean desirability. The real question is how it has been used.
There are all sorts of different types of presses used throughout the industry and a straight side double crank press can vary dramatically in size. This guide provides you with general tips on inspection.
To begin, always check the light curtains and make sure the facility manager or operator stops the press cycle. Next, check the machine’s manufacturer’s plate and go over the specifications of the press. Check the stroke, the length between the terminal points of the motion. The shorter the stroke, the higher the speed of the press. Record general specs- the die clearance, strokes per minute, length and width of the bed (foundation of the press) and ram size.
Next, check the T-Slots. A normal T- Slot is patterned 6” center line but sometimes the patterns are customized for a certain requirement. This, of course, is important information when trying to find the right buyer.
Using a heavy duty flashlight, go over each surface checking for gouges, scratches, or cracks. Stand back and walk around the machine to check for any major cracks, welds, or painted "cover-ups" of damage.
Check gibs for their condition and proper adjustability. Performing a jack test will tip you off to any internal problems in the ram and crown. Ask if the press has a cushion in it’s bed as they are not always evident. If there is a lofted area or basement in the plant try to use them to inspect above and below the press if applicable. Lastly, look in the electrical panel to see if it needs attention.
Ask the facility operator to turn the machine on, if possible, and watch the ram’s ability to move up and down as well as reach the very bottom and top of its track. Listen for any loud bangs and gear grinding. Noises that do not sound smooth and suggest struggling in the press should be addressed. Take a 3 minute video (minimum) of the press in action. Buyers love videos and assurance that the machine is fully-functional.
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