The Sheet Metal Shop .Com

Kinks - stumped

kevoinok - Feb 27, 2007 - 03:12 AM
Post subject: stumped

Im trying to form an 8.375 to 4.125 o.d. reducer 3 inches tall in 16ga. #8 stainless. My pattern is good but so far forming with the roll is not. I tried one also splitting the pattern and step braking, but the brakes dont look so good in the mirror polish. Any tips?

kevoinok - Feb 27, 2007 - 03:14 AM
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Oh ya, its also eccentric, straight one side

marky - Feb 27, 2007 - 01:18 PM
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IF ITS A CONICAL FRUSTRUM IT SHOULD ROLL O.K , HAVE YOU TRIED USING A PIECE OF ANGLE IRON AS A GUIDE AT THE 4.125 END THIS WILL HELP PULL THE WIDER END AROUND, YOU WILL HAVE TO PROTECT YOUR STAINLESS AS THIS METHOD TENDS TO DRAG SLIGHTLY. MARKY

device - Mar 01, 2007 - 02:21 AM
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make sure you pre-form the ends of the pattern first..
put about a 1/4 inch into the barke and bend upwards the give it a slight radius(do not brake it) just use your hand to bend it up slightlt..to get the flat spot out when you take it to the rolls..
make sure one side of the rolls is set for you 8 3/8 inch and the other is 4 1/8..the have the larger cone side fit looser in the rolls so you can make it move through the rolls quicker..
tought to explan..
also the angle at the one side as mentioned about halp greatly..as a guid for the tight end..
is your seam on the straight side..
i have had to reverse the way i was rolling it before ..from left to right because i was having a hard time..
flip flopping it.
some idears..

kevoinok - Mar 04, 2007 - 05:43 AM
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thanks for the starter in the beak tip. i did this but ended up having to step about the first 3/4 with maybe 6 super soft kinks. it came out decently. Ill try to post a pic

device - Mar 04, 2007 - 05:53 PM
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yeah i want to have a look see!

locklin - Jan 20, 2008 - 07:47 AM
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Do you have a trumpet stake? I'm sure you can form it on one of these or possibly a candlemakers stake. Please let me know if you had any luck.