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Steve Dolezal
Product Engineering Manager
Columbia Steel Casting Co., Inc.
(800) 547-9471
Steve Dolezal has been a crusher wear parts engineer at Columbia Steel for 21 years. His knowledge includes a wide variety of jaw, cone and roll crusher makes and models, as well as their specific industry applications and equipment conditions. He works closely with customers to recommend and develop wear parts to better meet their needs, often resulting in increased service life, throughput, or both. Doug Henderson will answer questions about gyratory crusher wear parts with his expertise as a product engineer at Columbia Steel for over 10 years.
Material in a Cone Liner
Posted by Chris from Calgary, AB, CA on September 10, 2009
What is the composition make up of a manganese cone liner? Is there Iron in it and if so how much expressed as a %. Thank you.
The typical manganese steel cone liner is made from ASTM A128 grade B-2. This covers a range of alloys that fit within the following composition range: 1.05-1.20% Carbon, 11.5-14.0% Manganese. These alloys also have some silicon and tramp elements with the remainder being approximately 85% elemental iron. Chromium, molybdenum and nickel can also be added to these steels for various reasons. Columbia Steel Casting Co., Inc. and other producers also produce liners from various premium grades of manganese steel that contain additional carbon, manganese and other alloy elements to improve the service life of the casting.
Answered by: David Havel, P.E., Chief Metallurgist
Blasting Tubes & Aggregate Directories
Posted by Rick from Hartsville, SC, US on July 19, 2009
Why do some quarries use blasting tubes (cardboard tubes) when blasting and some do not? Also - what is the best resource for getting a directory for all the Quarries in North America?
Blasting and explosives are outside my expertise. Try contacting an explosives company like Dyno Nobel Inc. - www.dynonobel.com.
Regarding directories of Quarries in North America, try these for US quarries:
* North American Aggregate Industry Directory - www.rockproducts.com
* USGS Aggregates Industry Atlas - www.aggman.com/atlas
* USGS directories and atlas from the source - http://minerals.usgs.gov/minerals/pubs/commodity/stone_crushed/
For Canada, try this government site: http://mmsd.mms.nrcan.gc.ca/stat-stat/mine-mine/index-eng.aspx
Normal Toggle Seat Life
Posted by Mark from Fayetteville, AR, US on July 1, 2009
If maintained properly, how long should toggle seats and plate run in a jaw crusher?
In any given single toggle jaw crusher there are typically two toggle seats, a frame and a pitman side, and one toggle plate. Although there are many factors in just how long a set of seats and plate will last, I have typically seen them average from three to eighteen months depending on the severity of the application.
Feed Opening Size Feasibility
Posted by Sid from New Delhi, AL, IN on June 19, 2009
There’s a 36″ X 38″ jaw crusher up for sale at quite a reasonable price. I find the feed opening size quite odd as I had heard about 36″ X 36″ and 36″ X 42″ size, but never about 36″ X 38″. I have doubts about the feasibility of the crusher. Can you tell me the relation between the feed opening size and feasibility? To what limit is it feasible to keep the shorter dimension of feed opening constant (36″ in this case) and keep on increasing the larger dimension (38″ in this case)?
Thanks in advance
Sid
Typically the designation or size of jaw is called out by it top opening. The first dimension is usually the distance between the stationary and movable jaws and the second dimension is the roughly the distance between the cheek plates -- thus the “usable opening”.
I agree with you when you say that the jaw size”36 x 38” is a bit odd. I checked back into the records at my disposal and found that most of the companies that manufacture jaws have a 36 x 42 or a 36x 48. This seems to be the norm for a 36” opening between the stationary & movable jaws. That’s not to say there has not been one made with the dimensions you have called out.
I’m not sure just what you mean by feasibility. Any given crusher manufacturer can, and at times has made jaw sizes out of this normal range of widths. What initially comes to mind are the jaws which have been produced to accommodate the recycling industry. In some cases there have been width increases to allow longer “slabs” of material to readily enter the chamber without bridging & plugging up the crusher.
If I were to have the manufacturer of the jaws you are reviewing, I would be happy to look into it further. If you choose, you can contact me directly at steve_dz@columbiasteel.com.
Columbac II - Epoxy Resin and Hardner Mix Ratio
Posted by Eugene from Newark, CA, US on May 28, 2009
What is the mix ratio of the epoxy resin and the hardner for the Columbac II?
Each “kit” of backing Columbia supplies comes with premeasured quantities of epoxy and catalyst. However, the ratio for both of our types backings are as follows:
Type of Backing................By Volume...............By Weight
Regular……………………100 / 10.9…………..100 / 6
Hi-Impac…………………..100 / 12.6………… 100 / 7.3
As always, the directions should be currently affixed to each container and they should be followed explicitly.