Use of an in-seam tester to determine effects of bit type on primary dust generation
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Add terms to the query box

Query box

Help
Clear All
i

Use of an in-seam tester to determine effects of bit type on primary dust generation

Filetype[PDF-7.23 MB]


Select the Download button to view the document
This document is over 5mb in size and cannot be previewed
  • English

  • Details:

    • Personal Author:
    • Description:
      "A U.S. Bureau of Mines designed and fabricated in-seam tester, retrofitted with a dust shroud, was used to establish a respirable dust index (rdi) and to determine cutting forces from a variety of bit types in four coal mines and a salt mine. Results from cutting tests at four coal mines showed that radial bits required the lowest cutting force and the least specific energy. Generally, for each conical bit the rdi and cutting force increased when the included bit tip angles increased from 70 deg to 90 deg. During field tests it was not possible to measure the total quantity of respirable dust produced by each cut; therefore, attempts were made to determine the amount of dust that became airborne from each test cut. The test results show that the quantity of airborne respirable dust is very erratic and cannot be related to bit type. Two statistical methods were employed to analyze rdi, but no correlation was found between the rdi and bit type. Despite scatter in test results for rdi, significant difference was found in rdi generated in four coal seams. In general, rdi increased with increased cutting force." - NIOSHTIC-2 NIOSH no. 10007305
    • Document Type:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at stacks.cdc.gov