Most of our manufactured products are sold with warranties. Warranty periods, which vary by product components, generally range from 1 to 10 years; however, the warranty period for a limited number of specifically identified components in certain applications is a lifetime. The majority of the products sold have warranties on components which range from 1 to 3 years. The amount charged to expense for warranties is based on management’s assessment of the cost per service call and the number of service calls expected to be incurred to satisfy warranty obligations on the current net sales.

During the three months ended September 28, 2019, we recorded warranty expense at a rate of approximately 1.8% of sales, which was nearly equal to the rate in the three months ended September 29, 2018 of 1.7% of sales. During the nine months ended September 28, 2019, we recorded warranty expense at a rate of approximately 1.7% of sales, which was equal to the rate in the nine months ended September 28, 2018 of 1.7% of sales.

The following table summarizes current period charges, adjustments to previous estimates, if necessary, as well as settlements, which represent actual costs incurred during the period for the three and nine months ended September 28, 2019, and September 29, 2018. The reserve is determined through specific identification and assessing Company history. Expected future obligations are discounted to a current value using a risk-free rate for obligations with similar maturities.

	Beginning				Charged								End of
Accrued Warranty	of Period		Acquired		to Expense		Adjustments			Settlements			Period
(in thousands)
Three months Ended September 28, 2019	$	5,980	$	-	$	3,600	$	660		$	(3,381	)	$	6,859

Three months Ended September 29, 2018	$	5,368	$	509	$	3,307	$	(21	)	$	(3,129	)	$	6,034

Nine months Ended September 28, 2019	$	6,149	$	-	$	9,595	$	868		$	(9,753	)	$	6,859

Nine months Ended September 29, 2018	$	5,386	$	509	$	8,524	$	(229	)	$	(8,156	)	$	6,034